The distance between city A and city B is 100 km.A car travels from city A to city B at a constant speed of x km/h and returns at a constant speed of y km/h,Express the time taken for the whole journey in x and y.
time taken=distance tracelled/speed
人气：461 ℃ 时间：2020-06-11 02:54:55
解答
100/x+100/y
100是路程、x y 分别为去、回的速度、
路程/速度=时间
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