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How much time is required to travel a boat in that river for 10 km. downstream them 10 km. upstream.

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The velocity of a river is 2 km/hr.
How much time is required to travel a boat in that river for 10 km. downstream them 10 km. upstream.
Velocity of boat is 3 km/hr in still water.

posted May 25 by Saif Khanam

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