a man can row at a speed of 7 kmh- 1 in still water to a certain point upstrea

Question

a man can row at a speed of 7 kmh- 1 in still water to a certain point upstream and back to the starting point in a river, whose speed of flowing is 3 kmh'. what is his average speed in the total jour

Options:

A . 2 5/7 kmh-1

B . 3 5/7 kmh-1

C . 4 5/7 kmh-1

D . 5 5/7 kmh-1

Answer: Option D
Explanation :

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