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A river is flowing with a steady speed o...

A river is flowing with a steady speed of 4km/h. One rows his boat down stream in the river and then returns by rowing upstream in the same river.When he returns to the starting point ,the total distance covered by him is 42km.If the return journey takes 2 h more than his outward journey, then the speed of his rowing in still water must be

A

12 km/h

B

10 km/h

C

9 km/h

D

8 km/h

Text Solution

Verified by Experts

The correct Answer is:
B
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