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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.

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The correct Answer is:
5 km/hr
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S CHAND IIT JEE FOUNDATION-DISTANCE, TIME AND SPEED -Unit Test-3
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