Kinematics 3

A train starts from station A with uniform acceleration \(a_1\) for some distance and then goes with uniform retardation \(a_2\) for some more distance to come to rest at station B. The distance between station A and station B is 4 km and the train takes \(\dfrac1{15} \) hours to complete the journey. If the accelerations are in \(\text{km/min}^2\) then find the value of \(\dfrac1{a_1} + \dfrac1{a_2} \) is: \(\text{__________} \).

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