A man rows to a place 40 km distant and come back in 9 hours He finds that he can row 5 km with the ...........

Quantitative Aptitude ( CCS) Boats and Streams

A man rows to a place 40 km distant and come back in 9 hours. He finds that he can row 5 km with the stream in the same time as 4 km against the stream. The rate of the stream is.

1 km/hr

1.5 km/hr

2 km/hr

2.5 km/hr

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Explanation:

Speed downstream = 5/x
Speed upstream = 4/x
40/(5/x) + 40/(4/x) = 9
X = ½
So, Speed downstream = 10 km/hr, Speed upstream = 8 km/hr.
Rate of the stream = 1/2 * 2 = 1 kmph