Two trains of equal lengths take 20 and 30 seconds respectively to cross an electric pole If the len...........

Quantitative Aptitude (CDS) Problems on trains

Two trains of equal lengths take 20 and 30 seconds respectively to cross an electric pole. If the length of each train is 180 metres, in what time(in second) will they cross each other traveling in the opposite direction?

24sec

25sec

26sec

27sec

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Explanation:

Speed of the first train = (180/20)m/sec = 9 m/sec

Speed of the second train = (180/30)m/sec =6m/sec

Relative speed = (9+6) = m/sec = 15m/sec

Required time = (180+180)/15sec = 24sec