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The speed of a boat in still water is...

The speed of a boat in still water is 15 km/hr. It can go 30 km upstream and return downstream to the original point in 4 hours 30 minutes. Find the speed of the stream.

A

5km/hr

B

8km/hr

C

10km/hr

D

15ikm/hr

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The correct Answer is:
A
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