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
Speed of stream = 3 km/h.

Hence, option 2 is the correct answer.