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Two trains leave New Delhi at the same time. One travels north at 60 kmph and the other travels south at 40 kmph.

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Two trains leave New Delhi at the same time. One travels north at 60 kmph and the other travels south at 40 kmph. After how many hours will the trains, be 150 km apart ?

(a) 3/2 (b) 4/3 (c) 3/4 (d) 15/2 

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(a) Since, both trains are moving in opposite directions, so relative speed of one train with respect to the other 

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