A man can row three-quarters of a kilometre against the stream in 11 minutes and down the stream in 7 minutes. The speed (in km/hr) of the man in still water is: ?->(Show Answer!)

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A man can row three-quarters of a kilometre against the stream in 11 minutes and down the stream in 7 minutes. The speed (in km/hr) of the man in still water is: ?->(Show Answer!)

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1. A man can row three-quarters of a kilometre against the stream in 11 minutes and down the stream in 7 minutes. The speed (in km/hr) of the man in still water is:

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By: guest on 01 Jun 2017 05.44 pm

We can write three-quarters of a kilometre as 750 metres, and 11 minutes as 675 seconds. Rate upstream = 750 m/sec = 10 m/sec. 675 9 Rate downstream = 750 m/sec = 5 m/sec. 450 3 Rate in still water = 1 10 + 5 m/sec 2 9 3 = 25 m/sec 18 = 25 x 18 km/hr 18 5 = 5 km/hr.

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