Pipes and Cisterns Aptitude Questions

1. 
   

   Two pipes A & B can fill the tank in 12 hours and 36 hours respectively. If both the pipes are opened simultaneously, how much time will be required to fill the tank?

1. A. 6 hours     
2. B. 9 hours        Correct Answer
3. C. 12 hours      
4. D. 15 hours      

2.  

   
   

   A tank is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The second pipe fills the tank 5 hours faster than the first pipe and 4 hours slower than the third pipe. The time required by the first pipe is:

1. A. 6 hours     
2. B. 10 hours      
3. C. 15 hours        Correct Answer
4. D. 30 hours      

3.  

   
   

   Two pipes can fill a tank in 6 hours and 8 hours respectively while a third pipe empties the full tank in 12 hours. If all the three pipes operate simultaneously, in how much time will the tank be filled?

1. A. 7(1/2) hrs     
2. B. 4(4/5) hrs        Correct Answer
3. C. 3 (2/7) hrs      
4. D. 1(1/5) hrs      

4.  

   
   

   Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:

1. A. 60 gallons     
2. B. 100 gallons      
3. C. 120 gallons        Correct Answer
4. D. 180 gallons      

5.  

   
   

   Two pipes can fill a tank in 10 and 14 minutes respectively and a waste pipe can empty 4 gallons per minute. If all the pipes working together can fill the tank in 6 minutes, what is the capacity of the tank?

1. A. 120 gallons     
2. B. 240 gallons      
3. C. 450 gallons      
4. D. 840 gallons        Correct Answer

6.  

   
   

   A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?

1. A. 20 hours     
2. B. 25 hours      
3. C. 35 hours        Correct Answer
4. D. Cannot be determined      

7.  

   
   

   Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?

1. A. 1 hour     
2. B. 2 hours      
3. C. 6 hours        Correct Answer
4. D. 8 hours      

8.  

   
   

   Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

1. A. 12 min       Correct Answer
2. B. 15 min      
3. C. 25 min      
4. D. 50 min      

9.  

   
   

   A booster pump can be used to fill as to empty the tank. The capacity of the tank is 1200 m3. The emptying capacity of the tank is 10 m3 per minute higher than its filling capacity and the pump requires 4 minutes lesser to vacant the tank than it requires to fill it. Calculate the filling capacity of the pump.

1. A. 25     
2. B. 50        Correct Answer
3. C. 75      
4. D. 100      

10.  

    
    

    An electric pump can fill a tank in 4 hours. Due to leakage in the tank, it took 4(1/2) hrs to fill the tank. If the tank is full, how much time will the leak take to empty the full tank?

1. A. 8 hrs     
2. B. 16 hrs      
3. C. 21 hrs      
4. D. 36 hrs        Correct Answer

11.  

    
    

    A pipe can fill a tank in 4 hours. Because of a leak, it took 6 hours to fill the tank completely. How much time will the leak take to empty the tank ?

1. A. 12 hours       Correct Answer
2. B. 10 hours      
3. C. 7 hours      
4. D. 5 hours      

12.  

    
    

    Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. If both the taps are opened simultaneously and the tap A is closed after 3 minutes, then how much more time will it take to fill the tank by tap B

1. A. 7 min 15 sec     
2. B. 7 min 45 sec      
3. C. 8 min 5 sec      
4. D. 8 min 15 sec        Correct Answer

13.  

    
    

    Two pipes A and B can fill a tank in 10 and 40 minutes respectively. If both the pipes starts together, then how long will it takes to fill the tank ?

1. A. 6 minutes     
2. B. 8 minutes        Correct Answer
3. C. 12 minutes      
4. D. 15 minutes      

14.  

    
    

    One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in

1. A. 81 minutes     
2. B. 108 minutes      
3. C. 144 minutes        Correct Answer
4. D. 192 minutes      

15.  

    
    

    Two pipes A and B can fill a tank in 2 hrs and 4 hrs respectively. Another piper C can empty the tank in 12 hrs. If all the three pipes open together, then how much time will be taken to fill the tank ?

1. A. 45 minutes     
2. B. 50 minutes      
3. C. 1 1/2 hours        Correct Answer
4. D. 2 1/2 hours      

16.  

    
    

    A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

1. A. 4.5 hrs     
2. B. 5 hrs      
3. C. 6.5 hrs      
4. D. 7.2 hrs        Correct Answer

17.  

    
    

    A leak in the bottom of a tank can empty the full tank in 8 hours. An inlet pipe fills water at the rate of 6 litres a minute. When the tank is full, the inlet is opened and due to the leak, the tank is empty in 12 hours. How many litres does the cistern hold?

1. A. 7580     
2. B. 7960      
3. C. 8290      
4. D. 8640        Correct Answer

18.  

    
    

    Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled?

1. A. 2     
2. B. 2.5      
3. C. 3        Correct Answer
4. D. 3.5      

19.  

    
    

    A pump can fill a tank with a water in 2 hours. Because of a leak, it took 2x1/3 hours to fill the tank. The leak can drain all the water of the tank in

1. A. 5 hrs     
2. B. 7 hrs      
3. C. 12 hrs      
4. D. 14 hrs        Correct Answer

20.  

    
    

    12 buckets of water fill a tank when the capacity of each tank is 13.5 litres. How many buckets will be needed to fill the same tank, if the capacity of each bucket is 9 litres?

1. A. 18       Correct Answer
2. B. 15      
3. C. 16      
4. D. 12      

21.  

    
    

    A cistern is filled by Pipe A and Pipe B together in 2.4 hours. Pipe A alone can fill the cistern at the rate of 100 litres per hour. Pipe B alone can fill the cistern in 4 hours. What is the capacity of the cistern?

1. A. 1200 litres     
2. B. 600 litres        Correct Answer
3. C. 1000 litres      
4. D. 500 litres      

22.  

    
    

    A tank has three taps P, Q and R. Taps P and Q can fill the tank in 1.5 and 2 hours, respectively. Tap R can empty the completely filled tank in just half hour. Tap P is opened at 8 am, tap Q is opened at 9am and tap R is opened at 10 am. At what exact time will the tank be empty?

1. A. 12 pm     
2. B. 1.25 pm      
3. C. 12.12 pm        Correct Answer
4. D. 12.28 pm      

23.  

    
    

    Two pipes M and N are opened together to fill a tank. Both the pipes fill the tank in time X minutes. When M alone is filling the tank, it takes 9 minutes more time than X to fill the tank. In a similar manner N takes 16 minutes more time than X to fill the tank. What is the value of X?

1. A. 12 minutes       Correct Answer
2. B. 7 minutes      
3. C. 25 minutes      
4. D. 144 minutes      

24.  

    
    

    A tap can fill a tub in 24 hours. Due to a leak at the bottom of the tub, the tap fills the tub in 36 hours. If the tub is full, how much time will the leak take to empty it?

1. A. 72 hours       Correct Answer
2. B. 48 hours      
3. C. 60 hours      
4. D. 96 hours      

25.  

    
    

    A water tank has two pipes to fill water in it. One of the pipes fills water at the rate of 100 litres per hour. The tank is filled by the other pipe in 6 hours and by both pipes together in 4.2 hours. What is the capacity of the tank in litres ?

1. A. 860 litre     
2. B. 980 litre      
3. C. 1120 litre      
4. D. 1400 litre        Correct Answer

26.  

    
    

    If pipe A can fill the tank in 45 minutes and pipe B in 30 minutes, find the time to fill the tank if both the pipes are opened together.

1. A. 12 minutes     
2. B. 20 minutes      
3. C. 18 minutes        Correct Answer
4. D. 15 minutes      

27.  

    
    

    Pipes A and B fill a tank in 5 and 6 hours respectively. Pipe C empties the tank in 12 hours, if you open all the three pipes together this tank will be filled in?

1. A. 3 9/17 hours       Correct Answer
2. B. 4.5 hours      
3. C. 1.25 hours      
4. D. 4 7/17 hours      

28.  

    
    

    Two pipes A and B can fill a cistern in 37.5 minutes and 45 minutes respectively. This cistern will be filled in half an hour if both the pipes are opened together initially and pipe B is then turned off after X minutes. What is X?

1. A. 10 minutes     
2. B. 15 minutes      
3. C. 12 minutes      
4. D. 9 minutes        Correct Answer

29.  

    
    

    A pipe is 30 m long and is 45% longer than another pipe. Find the length of the other pipe.

1. A. 20.68       Correct Answer
2. B. 20      
3. C. 20.12      
4. D. 20.5      

30.  

    
    

    A cistern has two taps attached to it. Tap B can empty the cistern in 45 minutes. But Tap A can fill the cistern in just 30 minutes. Rohit started both taps unknowingly but realized his mistake after 30 minutes. He immediately closed Tap B. Now after this, in how much time will the cistern be filled?

1. A. 30 minutes     
2. B. 45 minutes      
3. C. 15 minutes      
4. D. 20 minutes        Correct Answer

31.  

    
    

    There is a leak at the bottom of a cistern. Due to this it takes 8 hours to fill the cistern. Had there not been a leak, it would take one hour less to fill the cistern. How much time does it take for the leak to completely empty the cistern?

1. A. 48 hours     
2. B. 55(1/3) hours      
3. C. 56 hours        Correct Answer
4. D. 15 hours      

32.  

    
    

    A cistern is normally filled with water in 10 hours but takes 5 hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty the cistern in

1. A. 20 hours     
2. B. 40 hours      
3. C. 50 hours      
4. D. 30 hours        Correct Answer

33.  

    
    

    Pipe A can fill a tank 5 times faster than Pipe B and takes 32 minutes less than Pipe B to fill the tank. If both the pipes are opened together, then in how much time the tank would be full?

1. A. 32/3 minutes     
2. B. 32/5 minutes      
3. C. 20/3 minutes        Correct Answer
4. D. 5/32 minutes      

34.  

    
    

    Pipe P can fill a tank in 38 hours. Pipe Q alone can fill it in 19 hours. Pipe R can empty the full tank in 133 hours. If all the pipes are opened together, how much time will be needed to make the tank full?

1. A. 28 hours     
2. B. 95 hours      
3. C. 14 hours        Correct Answer
4. D. 19 hours      

35.  

    
    

    3 pipes have diameters 2 cms, 3 cms and 4 cms. The ratio of water flowing through them is equal to ratio of the square of their diameters. The biggest pipe when open alone, can fill the entire pool in just 126 minutes. When all the pipes are opened together, the pool would be filled in how much time?

1. A. 2016/29 minutes       Correct Answer
2. B. 2111/126 minutes      
3. C. 215/63 minutes      
4. D. 155 minutes      

36.  

    
    

    Pipe P can fill a tank in 4 hours, pipe Q in 8 hours and pipe R in 24 hours. If all the pipes are open, in how many hours will the tank be filled?

1. A. 2 hours     
2. B. 2.4 hours        Correct Answer
3. C. 3 hours      
4. D. 3.5 hours      

37.  

    
    

    If a pipe can fill a tank in 6 hours, find the part of tank it fills in one hour.

1. A. 1/6       Correct Answer
2. B. 2/3      
3. C. 1/2      
4. D. None of these      

38.  

    
    

    Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, how long will it take to fill the tank?

1. A. 9 min     
2. B. 8 min        Correct Answer
3. C. 4 min      
4. D. 6 min      

39.  

    
    

    Two pipes P and Q can fill a tank in 10 hours and 14 hours respectively. If both pipes are opened simultaneously, how much time will be taken to fill the tank?

1. A. 4 hours 20 min     
2. B. 5 hours 49 min        Correct Answer
3. C. 3 hours 50 min      
4. D. 3 hours 22 min      

40.  

    
    

    Two pipes A and B can fill a tank in 24 minutes and 32 minutes respectively. If both the pipes are opened simultaneously, after how much time should B be closed so that the tank is full in 18 minutes?

1. A. 5 minutes     
2. B. 6 minutes      
3. C. 8 minutes        Correct Answer
4. D. 9 minutes      

41.  

    
    

    Pipe R can empty a full tank in 30 hours. But two pipes P and Q can fill a tank in 15 hours and 10 hours respectively. Ram unknowingly opened all three taps. After 2 hours Shyam realized it and closed Pipe R. Due to this mistake how much time more would it take to fill the tank?

1. A. 18 minutes     
2. B. 24 minutes        Correct Answer
3. C. 1 hour 20 minutes      
4. D. 2 hours 15 minutes      

42.  

    
    

    A cistern can be filled in 6 hours by taps P and Q. If tap R also joins them, then cistern is filled in 5 hours. Tap P can fill the cistern at twice the rate of tap Q. In what time tap Q and R fill the cistern?

1. A. 9.75 hours     
2. B. 10. 90 hours      
3. C. 11.25 hours        Correct Answer
4. D. 12.90 hours      

43.  

    
    

    A tap having diameter 'd' can empty a tank in 84 min. How long another tap having diameter '2d' take to empty the same tank?

1. A. 21 minutes       Correct Answer
2. B. 42 minutes      
3. C. 168 minutes      
4. D. 28 minutes      

44.  

    
    

    Two pipes M and N can fill a pool in 40 minutes and 60 minutes, respectively. The entire pool can completely be emptied by another pipe P in 30 minutes. M, N and P are opened alternatively and each is kept open for just 1 minute. In how much time will the pool be filled?

1. A. 180 minutes     
2. B. 167 minutes        Correct Answer
3. C. 177 minutes      
4. D. 165 minutes      

45.  

    
    

    A inlet pipe can fill a tank in 12 hours and an outlet pipe can empty the tank in 16 hours. If both the pipes are opened simultaneously, find the time taken to fill the tank.

1. A. 36 hours     
2. B. 12 hours      
3. C. 4 hours      
4. D. 48 hours        Correct Answer

46.  

    
    

    Tap P alone fills a cistern in 2 hours; while tap Q alone fills the same cistern in 3 hours. A new tap R is attached to the bottom of the cistern which can empty the completely filled cistern in 6 hours. Sunny started all three taps together at 9am. When will the tank be full?

1. A. 10.30 am       Correct Answer
2. B. 11.15 am      
3. C. 12 pm      
4. D. 9.45 am      

47.  

    
    

    Two pipes M and N can fill a tank in 22.5 and 15 minutes, respectively. If both the pipes are opened simultaneously, after how much time should N be closed so that the tank is full in 18 minutes?

1. A. 4 minutes     
2. B. 3 minutes        Correct Answer
3. C. 4.5 minutes      
4. D. 2.5 minutes      

48.  

    
    

    A leak at the bottom of the tank can empty the tank in 5 hours, while an inlet pipe can fill the same tank at the rate of 6 litres per minute. When the tank is full, the inlet is opened and the tank gets empty in 8 hours due to the leakage. Find the capacity of the tank.

1. A. 1800 litres     
2. B. 3600 litres      
3. C. 4800 litres        Correct Answer
4. D. 5760 litres      

49.  

    
    

    A pipe can fill a tank in 6 hours. Another pipe can empty the tank in 12 hours. If both pipes are opened simultaneously, the part of tank filled by both pipes in 1 hour is?

1. A. 1/9 th part     
2. B. 1/6 th part      
3. C. 1/12 th part        Correct Answer
4. D. 1/3 rd part      

50.  

    
    

    Two pipes M and N can fill a tank in 22 hours and 33 hours respectively. In how much time will the tank be full, if both the pipes are opened simultaneously?

1. A. 18 hours     
2. B. 19/22 hours      
3. C. 1(1/11) hours      
4. D. 13(1/5) hours        Correct Answer