A man standing on a railway platform notices that a train going in one direction takes 10 seconds to pass him and other train of the same length takes 15 seconds to pass him. find the time taken by the two trains to cross each other when they are running in the opposite direction
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Let the length of each train be 'L'.
The velocity of the first train is L/10 m/s. The speed of the second train is L/15 m/s. If the two trains run opposite to each other, the relative velocity of the one of them with respect to the other is L/10+L/15 = 25L/150 = L/6.
The distance travelled by the one of the train with respect to the other is L. Thus, the time taken is (L)/L/6= 6 seconds
The velocity of the first train is L/10 m/s. The speed of the second train is L/15 m/s. If the two trains run opposite to each other, the relative velocity of the one of them with respect to the other is L/10+L/15 = 25L/150 = L/6.
The distance travelled by the one of the train with respect to the other is L. Thus, the time taken is (L)/L/6= 6 seconds
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