New Enroll in RBI Grade B New Batch - Starts on May 21

Question

A motor boat covers a certain distance downstream in a

river in 1 hour. It covers the same distance upstream in 1 hour 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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