Question

A motor boat covers a certain distance downstream in a river in 2 hours. It covers the same distance upstream in 2 hours and 30 minutes. If the speed of water is 3 km/h, then the speed of the boat in still water is:

A 27 km/hr
B 15 km/hr
C 34 km/hr
D 45 km/hr
E 42 km/hr
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