Question

Ricky can go on a motor boat with a speed of 15 km/hour in still water to a certain upstream point and come back to the starting point in a river which flows at a speed of 5km/hour. Find the average speed of motor boat for total journey?

A 11(1/3) km/hour
B 13(1/3) km/hour
C 11(2/3) km/hour
D 13(2/3) km/hour
E None of these
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