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A man can go on a motor boat with a speed of 15 km/hour in still water, he goes to a certain distance upstream 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 34/3 km/hour

B 40/3 km/hour

C 35/3 km/hour

D 41/3 km/hour

E None of these

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