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A body moving along a straight line trav...

A body moving along a straight line traversed one third of the total distance with a velocity `4 m//sec` in the first stretch. In the second stretch, the remaining distance is covered with a velocity `2 m//sec` for some time `t_(0)` and with `4 m//s` for the remaining time. If the average velocity is `3 m//sec`, find the time for which body moves with velocity `4 m//sec` in second stretch:

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