小杰、小丽分别在400米环形跑道上练习跑步和竞走,小杰的速度与小丽的速度之比是8:3,两人同时由一起点同向
出发,2分钟后相遇,问小杰的速度是多少?
人气：285 ℃ 时间：2019-08-31 09:24:49
解答
设第一次相遇时各自路程8x 3x
8x-3x=400 x=80
小杰路程 8×80=640
速度 640/2=320 m/min
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