1.

A man can row three quarters of a kilometre against the stream in 11 1/4 minutes and down the stream in 7 1/2 minutes. The speed (in km/hr) of the man in still water is

Answer»

5 kmh-1



RATE upstream = 750/675 = 10/9 ms-1
Rate downstream = 750/450 = 5/3 ms-1
∴ Rate in STILL water = 1/2 (10/9 + 5/3) ms-1
= 25/18 ms-1 = 25/18 x 18/5 = 5 kmh-1



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