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Two train leaves New Delhi at the same time. One travels towards North at 60 km/h and the other travels towards South at 40 km/h . After how many hours will the trains be 150 km apart?

3/2 h
4/3 h
3/4 h
15/2 h

Correct Answer: 3/2 h

Explanation:

Relative speed = 60 + 40 = 100 km/h
Time = Distance/speed = 150/ 00 = 3/2 h

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