A boat can row to a place 120 km away and come back in 25 hours The time to row 24 km with the strea...........

Quant (SSC) Boats and Streams

A boat can row to a place 120 km away and come back in 25 hours. The time to row 24 km with the stream is same as the time to row 16 km against the stream. Find the speed of current.

1.5 km/h

3 km/h

2 km/h

3.5 km/h

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Explanation:

Downstream speed = 24/x km/hr
Upstream speed = 16/x km/hr
120/(24/x) + 120/(16/x) = 25
Solve, x = 2 km/hr
So, downstream speed = 12 km/hr, upstream speed = 8 km/hr
Speed of current = 1/2 * (12 – 8) km/hr = 2 km/hr

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