A man can row three-quarters of a kilometer against the stream in 11 minutes and return in 7 minutes. The speed of the man in still water is?
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three quarters of a km= 750 m
45/4 mins= 675 secs, 15/2 mins= 450 secs
rate of upstream = (750/675)m/sec= 10/9 m/sec
rate of downstream = (750/450)m/sec = 5/3 m/sec
The speed of the main in still water= 1/2 * (10/9 + 5/3) = 25/18 m/sec = (25/18 * 18/5)= 5 km/hr
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