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The two trains leave from a and B at the same time. It takes 20 hours for the express train to complete the whole journey and 30 hours for the local train to complete the whole journey. The two trains meet 15 hours after departure. It is known that the express train stops for 4 hours and the local train stops for several hours?
First, take the distance between a and B as a whole "1", then the speed of express train is 120, the speed of local train is 130, the distance of a line when meeting: 120 × (15-4) = 1120, the distance of B line when meeting: 1-1120 = 920, the time of B line when meeting: 920 △ 130 = 13.5 (hours), the time of local train stop: 15-13.5 = 1.5 (hours), a: the local train stayed for 1.5 hours in the future of meeting
The two trains leave from a and B at the same time. It takes 20 hours for the express train to complete the whole journey and 30 hours for the local train to complete the whole journey. The two trains meet 15 hours after departure. It is known that the express train stops for 4 hours and the local train stops for several hours?
Take the distance between a and B as the whole "1", then the speed of express train is 120, the speed of local train is 130, the distance of a line when meeting: 120 × (15-4) = 1120, the distance of B line when meeting: 1-1120 = 920, the time of B line when meeting: 920 △ 130 = 13.5 (hours), the time of local train stop: 15-13.5 = 1
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