A train left the station at a speed of 70 km / h. After 7 hours, an electric train followed him from the same station at a speed of 84 km / h. In how many hours will the second train catch up with the first?
70×7 = 490 km the first train passed in 7 hours. This means that in order to catch up with him, the second needs to go the same distance, therefore,
490/84 = 5.8 hours
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