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问题 解答题

甲、乙两船由相距384千米的两个码头同时相向而行，甲船每小时行21千米，乙船每小时行27千米。几小时后两船相遇？（方程解）

答案

解：设x小时后两船x相遇，由题意得

21x+27x=384

         48x=384

             x=8

阅读理解

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单项选择题

同一轴相对车轮直径过大，（）易产生滑行，使车轮踏面擦伤。

A.小轮径车轮

B.大轮径车轮

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D.两者都不是
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