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Please write clearly the formulas and concepts behind it.

2. Two trains each moving with a constant velocity approach each other along a straight line. At a certain moment a man on the platform finds that the distance between the two trains is L and the two trains are going to collide with each other in a time 5L/7c. On the other hand another observer on one of the train sees the other train approaching him with a velocity 35cl37. Here c is the light velocity. What are the velocities of the two trains with respect (15 marks) to the man on the platform?

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