Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post If...........

Quantitative Aptitude ( CCS) Problems on trains

Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 300 metres, in what time will they cross each other travelling in opposite direction?

25 sec

18 sec

14 sec

12 sec

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Explanation:

Solution:
Speed of the first train = [300/10] m/sec = 30 m/sec.
Speed of the second train = [300/15] m/sec =20 m/sec.
speed = (30 + 20) m/sec = 50m/sec.
Required time = (300+300)/50secc = 12 sec.