Question

甲乙两车分别从A,B两地出发,相向而行。

甲 乙 两车分别从A、B两地出发相向而行. 出发时.甲、乙的速度比是5;4, 相遇后,甲的速度提高20% ,乙的速度提高 25% ,这样,当甲到达B地时.乙离A地还有15千米. 那么A.B两地相距多少?

Answer 1

设甲速度为5A乙速度为4A；相遇时用了时间为H；所以相遇后甲速度为6A乙速度为5A；相遇后到甲到B地用时为4AH/6A；所以得15千米＝5AH－5A（4AH/6A）可得AH＝9千米；AB两地相距为5AH+4AH＝9AH；所以相距为81千米。

Answer 2

解：设速度为W，则甲车为5W，乙车为4W。
5W·120%=4W·125%+15
（5·120%）W=（4·125%）W+15
6W=5W+15
W=15
则A地到B的距离为：
5·15·120%=90Km 或（4·15·125%=90Km）
答：AB两地相距90千米。

Answer 3

81千米
假设甲,乙速度：5V,4V 全程9Vt
15/(1Vt-4Vt/9 / 5V(1+20%)*4V(1+25%)) = 81

Answer 4

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Answer 5

81KM