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Train A travelling at 63 kmph can cross ...

Train A travelling at 63 kmph can cross a platform 199.5 m long in 21 seconds. How much time would train A take to complete cross (from the moment they meet) train B, 157 m long and travelling at 54 kmph in opposite direction which train A is travelling? (in seconds) `16` b. `18` c. `12` d. `10`

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