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Train at 144 kmph crosses a pole. Find time in seconds (given train length=800m).

1. 15
2. 18
3. 20
4. 25

Correct answer: 20

Solution

Speed=144 kmph=144×1000/3600=40 m/s. To cross a pole (length=train=800m): time=800/40=20 seconds.

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