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A boat moves along the flow of river bet...

A boat moves along the flow of river between two fixed points A and B. it takes `t_(1)` time when going downstream and takes `t_(2)` time when going upstream between these two points. What time it will take in still water to cover the distance equal to AB.

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`((2t_(1)t_(2))/(t_(1)+t_(2)))=(AB)/(v_(b))`
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