A man wants to cross a river perpendicularly He takes 4 minutes to cross the river in still water an...........

Quantitative Aptitude ( CCS) Boats and Streams

A man wants to cross a river perpendicularly. He takes 4 minutes to cross the river in still water, and takes 5 minutes in upstream. If the river is 100 metres wide, what is the speed of stream?

300 meters/hour

430 meters/hour

1000 meters/hour

200 meters/hour

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Explanation:

A man wants to cross a river perpendicularly so to reach perpendicularly he has to move (swim) at an angle with the river bank against the river (upstream) to reach the other end perpendicularly

Speed of the man in still water 100/4 = 25 meter/minute

Upstream speed = 100/5 = 20 meter/minute

Let the speed of the stream is x meter/minute

Accordingly

20 = 25 - x

x = 5 meters/minute

The speed of the stream is 5 meters/minute

5 x 60 meters/hour

300 meter/hour

The speed of the stream is 300 m/hours