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Two trains 200 metres and 150 metres lon...

Two trains 200 metres and 150 metres long are running on parallel rails in the same direction at speeds of 40 km/hr and 45 km/hr respectively. Time taken by the faster train to cross the slowed train will be `72\ s e con d s` b. `132\ s e con d s` c. `192\ s e con d s` d. `252\ s e con d s`

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