Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction? ?->(Show Answer!)

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Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction? ?->(Show Answer!)

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1. Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?

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By: guest on 01 Jun 2017 05.48 pm

Speed of the first train = 120 m/sec = 12 m/sec. 10 Speed of the second train = 120 m/sec = 8 m/sec. 15 Relative speed = (12 + 8) = 20 m/sec. Required time = (120 + 120) sec = 12 sec. 20

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