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

A) 7 sec

B) 17 sec

C) 9 sec

D) 12 sec

Speed of first train = 120/10 = 12 m/sec

Speed of second train = 120/15 = 8 m/sec

now speed is = 12 + 8 = 20 m/sec

so time taken = ((120 + 120) / 20)

= 12 sec

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