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A steamer moves with a speed of 4.5 km/ ...

A steamer moves with a speed of 4.5 km/ h in still water to a certain upstream point and comes back to the starting point in a river which flows at 1.5 km/h The average speed of steamer for the total journey is :

A

12 km/h

B

9 km/h

C

6 km/h

D

4 km/h

Text Solution

Verified by Experts

The correct Answer is:
D
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