A train of length l move with a constant speed vt. a person at the back of the train fires a bullet at time t = 0 towards a target which is at a distance of d (at time t =0) from the front of the train (on the same direction of motion). another person at the front of the train fires another bullet at time t = t towards the same target. both bullets reach the target at the same time. assuming the speed of the bullets, vb, are same, the length of the train is
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