A man can row boat at 5 kmph in still water If the velocity of current is 1 kmph and he takes 1 hour...........

Quantitative Aptitude ( CCS) Boats and Streams

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

2.5 km

3 km

2.4 km

3.6 km

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Explanation:

Speed of man in still water, x = 5 km/h
Speed of currant, y = 1 km/h
Speed of downstream = x + y = 5 + 1 = 6 km/h.
Speed of upstream = x – y= 5 – 1 = 4 km/h
According to the question,
D/6 + D/4 = 1
(2D + 3D)/12 = 1
5D = 12
D = 12/5 = 2.4 km

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