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Two trains of lengths 105 m and 90 m, respectively run at the speeds of 45 km/h and 72 km/h, respectively in opposite directions on parallel tracks. Find the time which they take to cross each other.

A) 5 s
B) 6 s
C) 7 s
D) 8 s

Correct Answer:


B) 6 s

Description for Correct answer:

Total length of the train =105+ 90 = 195m

Relative speed = 72 + 45 km/h

= \( \Large \left(117 \times \frac{5}{18}\right) = \frac{585}{18} m/s \)

Therefore, Required time = \( \Large \left(195 \times \frac{18}{585}\right) \) = 6 s

Part of solved Trains questions and answers : >> Aptitude >> Trains

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