我们知道,路程、时间、速度是行程问题中的三个基本量,只要知道其中的两个量就可以求出第三个量.但是,有些行程问题,只知道三个量中的一个,并且等量关系又比较隐蔽,按常规方法解这类问题往往比较困难.这时,我们如果把这类问题中的路程、时间分别看作工程问题中的工作量、工作时间,那么这类问题就转化为比较简单的工程同题,从而省时省力,迅速获解.例1 一只小船顺流航行从甲码头到乙码头需α小时,逆流航行这段路程需 b 小时,那么一木块顺水漂流这 We know that distance, time, and speed are the three basic quantities in the trip problem. If we know two of them, we can find the third quantity. However, for some trip problems, we only know one of the three quantities, and Equivalent relations are more subtle and it is often difficult to solve such problems according to conventional methods. At this time, if we consider the distance and time in such problems as the workload and working time in engineering problems, then these problems will be solved. Converted to a relatively simple engineering problem, saving time and effort, and quickly obtaining solutions. Example 1 A small boat needs to travel for a hour from A pier to B terminal, and a countercurrent of this journey takes b hours. Then a wooden block goes water Drifting this