关于行程问题的一个重要关系式是 路程速度 =时间 .因此列分式方程解行程问题的基本方法 ,就是用这一等量关系列出方程 .现以中考题为例 ,分类介绍如下 .一、一般行程问题例 1　从Ａ站到Ｂ站有 1 2 0千米 ,一辆客车和一辆货车同时从Ａ站出发 ,1小时后 ,客车在货车前面 2 4千米 An important relation about the itinerary problem is distance=time. Therefore, the basic method of solving the trip problem by using the fractional equation is to list the equations using this equation. Now take the exam questions as an example. The classification is described below. General Travel Problem Example 1 There is 120 kilometers from station A to station B. A passenger car and a truck depart from station A at the same time. After 1 hour, the bus is 24 kilometers in front of the truck.