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用来研究总数量、总份数和每份数量之间关系的问题,叫作份数问题。份数问题的特点是每一份的多少总是相等的,此类问题的解法应用非常广泛。一、用份数解行程问题。【例1】客车货车分别A、B两地同时相向而行,客车和货车的速度比是4:5。两车相遇后继续行驶,客车速度不变,货车提速20%,再过4小时,货车到达A地,客车离B地还有122千米。A、B两地相距多少千米?
The problem used to study the relationship between the total quantity, the total number of copies and the quantity per copy is called the question of the number of copies. The number of questions is characterized by the same number of each is always equal, the solution of such problems is widely used. First, the number of copies of the trip problem. [Example 1] Passenger wagons A and B, respectively, face each other at the same time. The speed ratio between passenger wagons and wagons is 4: 5. Two cars continue to drive after the encounter, the bus speed remains unchanged, the truck speed 20%, another 4 hours, the truck arrived at A, there are 122 km from the B bus. A, B, how many kilometers apart?