A boat can row to a place 56 km away and come back in 22 hours The time to row 21 km with the stream...........

Quantitative Aptitude ( CCS) Boats and Streams

A boat can row to a place 56 km away and come back in 22 hours. The time to row 21 km with the stream is same as the time to row 12 km against the stream. Find the speed of boat in still water.

1.5 kmph

3.5 kmph

5.5 kmph

7.5 kmph

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Explanation:

Solution:
Downstream speed = 21/x km/hr
Upstream speed = 12/x km/hr
56/(21/x) + 56/(12/x) = 22
Solve, x = 3 km/hr
So, downstream speed = 7 km/hr, upstream speed = 4 km/hr
Speed of boat = 1/2 * (7 + 4) km/hr = 5.5