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Speed of Boat in still water is 50% more...

Speed of Boat in still water is 50% more than speed of stream. Boat covers 30 km distance in downstream and 9 km distance in upstream and takes total 5 hours. Then find the speed of stream ?

A

9 km/hr

B

6 km/hr

C

11 km/hr

D

17 km/hr

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The correct Answer is:
A
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