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Q.

A person can row in still water at the rate of 8 km/h. If it takes him thrice as long to row upstream as to row downstream then the speed of the stream is:

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a

2 km/h

b

3 kmh

c

4 km/h

d

6 kmh

answer is C.

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Detailed Solution

Let x be the speed of the stream
∴8+x=3(8−x)⇒4x=16⇒x=4km/h

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A person can row in still water at the rate of 8 km/h. If it takes him thrice as long to row upstream as to row downstream then the speed of the stream is: