The speed of a boat when travelling downstream is 32 km/h, whereas

1. The speed of a boat when travelling downstream is 32 km/h, whereas when travelling upstream it is 28 km/h. What is the speed of the boat in still water?

1. A. 27 km/h
2. B. 29 km/h
3. C. 31 km/h
4. D. Cannot be determined

1. Answer & Explanation:

   
   

   Suppose the speed of boat in still water is x km/h and speed of stream is y km/h
   Speed of boat in downstream = (x + y) km/h
   x + y = 32 …(i)
   Speed of boat in upstream = (x – y) km/h
   x – y = 28 …(ii)
   Add. Eqs. (i) and (ii),
   we get
   2x = 60 x = 30 km/h
   

1. Related Question:

1. In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

1. A. 3 km/hr
2. B. 5 km/hr
3. C. 8 km/hr
4. D. 9 km/hr

1. Answer : C ( 8 km/hr )

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1. A boat running upstream takes 7 hours 48 minutes to cover a certain distance while it takes 4 hours to cover the same distance running downstream. What is the ratio between speed of the boat and the speed of water current respectively ?

1. A. 37 : 14
2. B. 41 : 16
3. C. 52 : 18
4. D. 59 : 19

1. Answer : D ( 59 : 19 )

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1. A man rows a boat at 8 km upstream in 2 hours and 2 km downstream in 40 minutes. How long will he take to reach 7 km in still water?

1. A. 2 hrs
2. B. 4 hrs 15 min
3. C. 6 hrs
4. D. 7 hrs 40 min

1. Answer : A ( 2 hrs )

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1. A man rows 40 km downstream and 22 km upstream taking 5 hours each time. What is the velocity of the current ?

1. A. 1.8 km/h
2. B. 1.9 km/h
3. C. 2.3 km/h
4. D. 2.7 km/h

1. Answer : A ( 1.8 km/h )

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1. A boat takes 90 mins less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is

1. A. 4
2. B. 3
3. C. 2.5
4. D. 2

1. Answer : D ( 2 )

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1. A boat goes 24 km upstream and 28 km downstream in 6 hrs. If it goes 30 km upstream and 21 km downstream in 6 hrs and 30 mins, find the speed of the steam.

1. A. 10 km/hr
2. B. 5 km/hr
3. C. 4 km/hr
4. D. 6 km/hr

1. Answer : C ( 4 km/hr )

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1. At his usual rowing rate, Rahul can travel 12 miles downstream in a certain river in 6 hrs less than it takes him to travel the same distance upstream. But if he could double his usual rowing rate for this 24mile round trip, the downstream 12 miles would then take only one hour less than the upstream 12 miles. What is the speed of the current in miles per hour?

1. A. 7/3
2. B. 4/3
3. C. 5/3
4. D. 8/3

1. Answer : D ( 8/3 )

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1. A and B in boat B1 challenge C and D in boat B2 in a race of 50 km. A and B take turns to row the stretches of 6 km and A begins. C and D take turns to row an hour and C begins. A and C can each row 5 km/hr, B and D each can row only 5(1/2) km/hr. Which boat wins and by what time?

1. A. B1 wins by 2 mins
2. B. B2 wins by 1(7/11) mins
3. C. Both reach the finishing spot together
4. D. B1 wins by 5(4/11)

1. Answer : B ( B2 wins by 1(7/11) mins )

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1. In a stream that is running at 2 km/hr, a man goes 10 km upstream and comes back to the starting point in 55 mins. Find the speed of the man in still water.

1. A. 20 km/hr
2. B. 22 km/hr
3. C. 24 km/hr
4. D. 28 km/hr

1. Answer : B ( 22 km/hr )

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1. A boatman goes 2 km against the current of the stream in 1 hr and goes 1 km along the current in 10 mins. How long will he take to go 5 km in stationary water?

1. A. 1 hr
2. B. 1 hr 15 mins
3. C. 1(1/2) hrs
4. D. 40 mins

1. Answer : B ( 1 hr 15 mins )