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A 150 m long train crosses a milestone i...

A 150 m long train crosses a milestone in 15 seconds and a train of same length coming from the opposite direction in 12 seconds. The speed of the other train is `36\ k m p h` b. `45\ k m p h` c. `50\ k m p h` d. `54\ k m p h`

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RS AGGARWAL-PROBLEMS ON TRAINS-All Questions
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