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Train A running at a speed of 180 km/h crosses a platform thrice its length in 36 s, and train B running at a speed of 54 km/h crosses a standing man in 50 s. Find the time taken by both trains to cross each other when running in the same direction.

1. 28 seconds
2. 24 seconds
3. 34 seconds
4. 36 seconds

Correct answer: 34 seconds

Solution

From the first condition, train A’s length can be found using its speed and the total distance covered while crossing the platform. From the second, train B’s length is obtained directly from the time to cross a man. Then use relative speed in the same direction to find the crossing time.

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