# 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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