First order solution of one variable 1. After 1.5 hours of meeting, the two cars continue to drive for 0.8 hours. At this time, the bus is 19 kilometers away from the ground of B and the truck is 65 kilometers away from the ground of A ① How many kilometers more buses travel than trucks per hour? ② How many kilometers are there between a and B?

1 Analysis: in the time of 1.5 + 0.8 = 2.3 hours, if the bus travels 65-19 = 46 km more than the truck, the average speed of the bus is faster than the truck: 46 / 2.3 = 20 km, the average speed of the bus is x km faster than the truck (1.5 + 0.8) x = 65-19x = 20, that is, the average speed of the bus is 20 km faster than the truck

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