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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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from x-t graph time taken `=21 s`
OR `(5m-3m)+(5m-3m)+5m=9m rArr` total steps `=21 rArr` time`=21 s`
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