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  • 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 r

    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
    英語人氣:956 ℃時間:2020-06-11 02:54:55
    優(yōu)質(zhì)解答
    100/x+100/y
    100是路程、x y 分別為去、回的速度、
    路程/速度=時間
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