A man can row 6 km hr in still water When the river is running at 2 km hr it takes him 1 frac12 hr t...........

Quantitative Aptitude ( CCS) Boats and Streams

A man can row 6 km/hr in still water. When the river is running at 2 km/hr, it takes him 1 ½ hr to row to a place and come back. How far is the place?

2.5 km

4 km

5 km

10 km

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Explanation:

B is speed of boat in still water, R is speed of stream
Time is total time taken for upstream and downstream
Distance = time * [B^2 – R^2] / 2*B
= 3/2 * [6^2 – 2^2] / 2*6
= 4 km

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