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A train passes a platform 90 m long i...

A train passes a platform 90 m long in 30 seconds and a man standing on the platform in 15 second. The speed of the train is a. `12. 4\ k m//h r` b. `14. 6\ k m//h r` c. `18. 4\ k m//h r` d. `121. 6\ k m//h r`

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RS AGGARWAL-PROBLEMS ON TRAINS-All Questions
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