# Harmonic acceleration!!!

A train stopping at 2 stations 4 km apart takes 4 min on the journey from one of the station to the other.Assuming it first accelerates with uniform acceleration x and then that of uniform retardation y. Find the value of $$\frac{1}{x} \quad + \quad \frac{1}{y}$$.

Give your answer in $$min^{2}$$.$$km^{-1}$$

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