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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 ?
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- 5 s
- 6 s
- 7 s
- 8 s
Correct Option: B
Total length of the train = 105 + 90 = 195 m
Relative speed = 72 + 45 km/h = 117 km/h = 117 x (5/18) = 585/18 m/s
∴ Required time = (195 x (18/585) s = 6 s
