客车从甲地开往乙地需要10小时
- 时间:2020-05-16 11:04:24
- 分类:数学世界
- 阅读:149 次
数学题:客车从甲地开往乙地需要10小时,货车从乙地开往甲地需8小时,两车同时出发,在离中点25千米相遇,甲、乙两地相距多少千米?
数学题解答:把总路程看作“1”,则客车速度为1/10,货车速度为1/8,两车速度比为:1/10:1/8=4:5。
即用相同的时间,客车行的路程是4份,货车行的是5份,总路程是9份。两车在离中点25千米的地方相遇。
说明25千米占总路程的:5/9 - 1/2 = 1/18
总路程:25 ÷ 1/18 = 450(千米)
450就是题目的答案。
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