A man rows a certain distance along the stream and against the stream in 1 hour and 1.5 hours respectively . If the velocity of the current is 3 km /hr. what is the speed of a man in still water?

A 12 km /hr
B 13 km /hr
C 11 km /hr
D 15 km /hr

Correct Answer: 15 km /hr

North of Sylhet is Meghalaya and East of Sylhet is Assam.
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