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A train takes t seconds to perform a jou...

A train takes t seconds to perform a journey. It travels for `t//n` seconds with uniform acceleration, then for time `(n-3) t//n` with uniform speed v and finally for `2t//n` seconds with uniform retardation. Then the average speed is ..........

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The correct Answer is:
`(2n-3)(v)/(2n)`
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