What is the length of a running train crossing another 180 metre long train running in the opposite direction? I. The relative speed of the two trains was 150 kmph. II. The trains took 9 seconds to cross each other. ?->(Show Answer!)

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What is the length of a running train crossing another 180 metre long train running in the opposite direction? I. The relative speed of the two trains was 150 kmph. II. The trains took 9 seconds to cross each other. ?->(Show Answer!)

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1. What is the length of a running train crossing another 180 metre long train running in the opposite direction? I. The relative speed of the two trains was 150 kmph. II. The trains took 9 seconds to cross each other.

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By: guest on 01 Jun 2017 05.48 pm

Let the two trains of length a metres and b metres be moving in opposite directions at u m/s and v m/s. Time taken to cross each other = (a + b) sec. (u + v) Now, b = 180, u + v = 150 x 5 m/sec = 125 m/sec. 18 3 9 = a + 180 (125/3) a = (375 - 180) = 195 m.

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