奥数题:两次相遇地点间相距120千米
- 时间:2020-06-05 20:30:28
- 分类:数学世界
- 阅读:94 次
奥数题:客货两车同时从甲、乙两地相对开出,途中相遇后继续前进,各到达对方出发地后立即返回,途中第二次相遇,两次相遇地点间相距120千米。客车每小时行60千米,货车每小时行48千米,甲乙两地相距多少千米?
数学题解答:需要先画一下线段图,自己先试一下,画好后可以与下方的线段图对比一下。
解:客车和货车的速度比=60:48=5:4
将全部路程看作单位1
那么第一次的相遇点在距离甲地1×5÷(5+4)= 5/9处
二次相遇是两车一共行完了三个全程。
那么第二次相遇点距离乙地1×3×5/9 – 1 = 5/3 – 1 = 2/3处
也就是距离甲处1-2/3=1/3处
所以甲乙距离=120÷(5/9-1/3)=12÷(2/9)=540千米
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