Q19. Two trains having equal lengths, take 1010 seconds and 1515 seconds respectively to cross a
post. If the length of each train is 120120 metres, in what time in seconds) will they cross each other
when travelling in opposite direction?
A. 25
B. 10
C. 20
D. 12
Answers
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3
Answer:
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Step-by-step explanation:
Speed of the first train = 120 / 10 m/sec = 12 m/sec
Speed of the second train = 120 / 15 m/sec = 8 m/sec
Relative speed = 12 + 8 = 20 m/sec
∴ Required time = 120 + 120 / 20 sec = 12 sec
∴ Option D
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