043. The speed of a boat in still water is 10 km/hr and speed of the current is 4 km/hr. The average speed of a man who travels certain distance by boat and returns back is
(A) 6.5 km/hr
(B) 8.4 km/h
(C) 9.2 km/hr
O (D) 9.5 km/hr
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c is the correct answer....
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