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a man rows upstream a distance of 9 km o...

a man rows upstream a distance of 9 km or downstream a distance of 18 km taking 3 hours each time. The speed of the boat in still water is :

A

`7 1/2 `km/h

B

` 6 1/2 km/h`

C

`5 1/2 km/h

D

`4 1/2 km/h

Text Solution

Verified by Experts

The correct Answer is:
D
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