A man rows to a place 48km distant and back in 14 hours He finds that he can row 4km with the stream...........

Quantitative Aptitude ( CCS) Boats and Streams

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A man rows to a place 48km distant and back in 14 hours. He finds that he can row 4km with the stream in the same time as 3km against the stream. Find the rate of the stream.

2 km/hr

1 km/hr

3 km/hr

3.5 km/hr

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Explanation:

Explanation:
Suppose he moves 4km downstream in x hours
Then, downstream a= 4 / x km/hr
Speed upstream b = 3/ x km/hr
48 / (4 /x) + 48 / (3/x) = 14
12x + 16x = 14
x = 1/2
a=8 km/hr ,b = 6 km/hr
rate of stream = ½ (8 – 6 )
= 1 km/hr

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