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Two trains A and B of length 400 m each ...

Two trains A and B of length 400 m each are moving on two parallel tracks with a uniform speed of `72 km h^-1` in the same direction, with A ahead of B. The driver of B decides to overtake A and accelerates by `1 m s^-2`. If after 50 s, the guard of B just brushes past the driver of A, what was the original distance between them ?

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