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 ?
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 ?
Answer:
(a)
We can solve this problem using the formula: distance = speed x time Let`s assume that the two trains start at time t=0. After t hours, the distance traveled by the northbound train is 60t km. Similarly, the distance traveled by the southbound train is 40t km. The distance between them is the sum of these distances, which is: distance = 60t + 40t = 100t km We want the distance to be 150 km. So we set up the equation: 100t = 150 Solving for t, we get: t = 1.5 hours Therefore, the two trains will be 150 km apart after 1.5 hours. So, the answer is option (a) 3/2.