Question

A man takes 10 hours to row 21 km upstream from point A to point B and back to A by boat. If he takes the same time to row 7 km downstream as upstream. If it takes time to cover 3 kilometers then find the velocity of the stream and the speed of the boat in still water.

A 2km/h, 5km/h
B 7km/h ,5km/h
C 5km/h ,3km/h
D 8km/h ,6km/h
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