25 Jan 2016

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Boat and Streams Questions

Boat and Streams

Q1. A boat goes 20 km downstream in one hour and the same distance upstream in two hours. The speed of the boat in still water is

a) 15 km/hr b) 10 km/hr c) 5 km/hr d) 7.5 km/hr

Q2 A boat goes 6 km an hour in still water, but takes thrice as much time in going the same distance against the current. The speed of the current (in km/hr) is:

a) 4 b) 5 c) 3 d) 2

Q3. A man rows 750 m in 675 seconds against the stream and returns in 15/2 minutes. Find his rowing speed in still water.

a) 3 kmph b) 4 kmph c) 5 kmph d) 6 kmph

Q4. A man can row at 5 kmph in still water. If the velocity of current is 1 kmph and takes him 1 hour to row to a place and come back, how far is the place

a) 2.5 km b) 3 km c) 2.4 km d) 3.6 km

Q5. The speed of a motor boat is that of the current of water as 36:5. The boat goes along with the current in 5 hours 10 minutes. It will come back in

a) 5 hours 50 minutes b) 6 hours c) 6 hours 50 minutes d) 12 hours 10 minutes

Q6. A person can row 15/2 km an hour in still water. He finds that it takes twice the time to row upstream than the time to row downstream. The speed of the stream is

a) 2 km / hour b) 2.5 km / hour c) 3 km / hour d) 4 km/hour

Q7. In a fixed time, a boy swims double the distance along the current that he swims against the current. If the speed of the current is 3 km/hr, the speed of the boy in still water is

a) 6 km/hr b) 9 km / hr c) 10 km/hr d) 12 km/hr

Q8. A boat goes 12 km downstream and comes back to the starting point in 3 hours. If the speed of the current is 3 km/hr, then the speed (in km / hr) of the boat in still water is

a) 12 b) 9 c) 8 d) 6

Q9. A boat covers 24 km upstream and 36 km downstream in 6 hours, while it covers 36 km upstream and 24 km downstream in 13/2 hours. The speed of the current is

a) 1 km/hr b) 2 km/hr c) 1.5 km/ hr d) 2.5 km/hr

Q10. Speed of motorboat in still water is 45 kmph. If the motorboat travels 80 km along the stream in 1 hour 20 minutes, then the time taken by it to cover the same distance against the stream will be

a) 3 hours b) 1 hour 20 minutes c) 2 hour 40 minutes d) 2 hour 55 minutes

Answer key
1 a
2 a
3 c
4 c
5 c
6 b
7 b
8 b
9 b
10 c

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