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Train A: 350m, passes pole in 17.5s. Crosses train B in a given condition. Find time for B to cross a platform.

1. 66 seconds
2. 70 seconds
3. 77 seconds
4. 84 seconds

Correct answer: 77 seconds

Solution

A speed=350/17.5=20m/s. Using the given crossing time and lengths, B's speed and length are derived. Time for B to cross the platform=77 seconds.

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