AB两地相距30千米,甲乙两人分别从AB两地同时出发相向而行1小时相遇

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  • 设甲速为xkm/h,乙速为ykm/h,则:

    x+y=30……(1)

    (20/60+5又40/60)x+30=5又40/60*y……(2)

    由(2)得:6x+30=17y/3

    18x-17y=-90………………(4)

    (1)*17+(4)得:35x=420

    x=12

    将x=12代入(1)得:y=18

    即甲速为12km/h,乙速18km/h .