A boat goes 6 km an hour in still water it takes thrice as much time in going the same distance agai...........

Quantitative Aptitude ( CCS) Boats and Streams

A boat goes 6 km an hour in still water, it takes thrice as much time in going the same distance against the current comparison to direction of current. The speed of the current (in km/hour) is ?

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Explanation:

Speed of boat in still water, x = 6 km/h
Let speed of the stream = y km/h
Downstream speed = (6 + y) km/h
Upstream speed = 6 – y km/h
According to Question,
3 [(Distance/6 + y) = (Distance/(6 - y)]
3/(6 + y) = 1/(6 - y)
(6 + y) = (18 – 3y)
4y = 12
y = 3
Thus, Speed of stream
= 3 km/h.

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