(1)设t秒种相遇,依题意得
6t+4t=400
解得t=40
(2)设m秒甲多跑一圈,依题意得
6t-4t=400
解得t=200
答:……
操场有400m的跑道,甲、乙同学练习跑,甲速度为6m一s,乙速度为4m一s,若两人同时同地反方向跑,多久相遇?
操场有400m的跑道,甲、乙同学练习跑,甲速度为6m一s,乙速度为4m一s,若两人同时同地反方向跑,多久相遇?
多久甲领先乙一圈,
多久甲领先乙一圈,
物理人气:147 ℃时间:2019-11-23 01:56:48
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