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In math class, the teacher asked a question: The distance between A and B is 1200 km. Take the express train from a to b.
Let the speed of high-speed train and express train be x and y respectively, and the following equation can be obtained, X=3Y,1500/x+10 =1500/y. Solve the equation, X=300. Y= 100。 In other words, the speed of high-speed rail is 300 kilometers per hour, and the speed of express train is 100 kilometers per hour.
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