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A boatman goes 21 km in the direction of...

A boatman goes 21 km in the direction of current and then comes back. Total time taken is 10 hours. Time taken to go 7 km in the direction of current is equal to time taken to go 3 km against the direction of current. Find the speed of current and speed of boat in still water.

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The correct Answer is:
y = 2 km/h, x= 5 km /h
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