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A train stopping at two stations 2 km ap...

A train stopping at two stations `2 km` apart on a straight line takes `4` minutes for the journey. Assuming that its motion its uniformly accelerated and then unoformly retarded. If `(1)/(x)+(1)/(y) = n`, where 'x' and 'y' are the magnitudesof the acceleration and retardation respectively. find the value of `n`.

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