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One train A 100m long is moving in a dir...

One train A `100m` long is moving in a direction with a speed of `20m/s`. Another train B `150m` long is moving with a speed of `30m/s` in the opposite direction.The train `B` crosses the train `A` in a time A) `5s` B) `10s` C) `18s` D) None of these

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