A person can row 15 2 km an hour in still water and he finds that it takes him twice as long to row ...........

Quantitative Aptitude ( CCS) Boats and Streams

A person can row 15/2 km an hour in still water and he finds that it takes him twice as long to row up as to row down the river. The speed of the stream is

2 km/hr

3 km/hr

5/2 km/hr

7/2 km/hr

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Explanation:

Speed of person in stilll water = 15/2 km/h
Let the speed in current/ stream = y km/h
Upstream time = 2 × (Downstream time)
Distance/ upstream speed = 2 × (Distance / Downstream speed)
2/(15 – 2y) = 2 × [2/(15 + 2y)
On solving y = 5/2 km/h