甲每时走5km，先走30min后，乙从甲的出发地沿同路追赶甲，乙每时最快走6km．问乙至少要多少时间才能赶上甲？
人气：148 ℃ 时间：2020-03-29 11:09:10
解答
设乙x小时赶上甲，
由题意得，6x≥5（x+
），
解得：x≥2.5．
答：乙至少要2.5小时才能赶上甲．
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