Question

A motor boat covers a certain distance downstream in a river in 3 hours. It covers the same distance upstream in 3 hours and 30 minutes. If the speed of water is 1.25 km/h, then the speed of the boat in still water is:

A 16.25 km/hr
B 27 km/hr
C 32.5 km/hr
D 31.5 km/hr
E 13.5 km/hr
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