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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Length of each train = 120m
Speed of ist train = 120/10 = 12m/s
Speed of 2nd train = 120/15 = 8m/s
Relative speed = 12+8 = 20 m/s
Required time = 120+120/20 =12 sec
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