A man can row at a speed of 12 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 3 km/hr. Find his average speed for total journey.

A man can row at a speed of 12 km/hr in still water to a certain upstr

1.	A man can row at a speed of 12 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 3 km/hr. Find his average speed for total journey.
A.	12 3 km/hr 4
B.	11 3 km/hr 4
C.	12 1 km/hr 4
D.	11 1 km/hr 4
E.	None of these
Answer» E. None of these

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A man can row at a speed of 12 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 3 km/hr. Find his average speed for total journey.

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