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Solving practical problems with equations 1. The distance between a and B is 528 kilometers. The two trains leave each other at the same time. Three hours later, the two trains meet. The speed of car a is 1.2 times that of car B. what is the speed of the two trains? 2. The distance between a and B is 450 km. It takes two hours for an express train to leave from a, and then another slow train to leave from B. after three hours, the two trains meet. It is known that the express train is 10 km faster than the slow train per hour. How many kilometers does the express train travel per hour? 3. The apprentice and apprentice process the same parts. The apprentice processes 20 parts per hour, and the master processes 30 parts per hour. The apprentice processes 25 parts first, and then the master starts to process. After a few hours, the apprentice and apprentice process the same number of parts?
1: Suppose the speed of car B is x km / h, then the speed of car a is 1.2x km / h. (x + 1.2x) × 3 = 5286.6x = 528x = 80 The speed of car B is 1.2x = 1.2 × 80 = 96 km / h Speed of car a 2: set the speed of the express train as X km / h (2 + 3) x
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