甲乙两地相距900千米,火车和客车相对开出,火车每小时行80千客车每小时行120千米,过多少小时两车在途中
过多少小时两车在途中相遇?
人气:105 ℃ 时间:2020-04-11 21:55:15
解答
120x+80x=900 x=4.5 4.5小时相遇
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