2016 AMC 8 第 4 题
先试着解答 2016 AMC 8 第 4 题，然后核对你的答案与视频与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2016 AMC 8 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
4.
奇努小时候能在 小时 分钟内跑 英里。现在他年老了，能在 小时内走 英里。现在他走一英里比小时候跑一英里多花多少分钟？
When Cheenu was a boy he could run miles in hours and minutes. As an old man he can now walk miles in hours. How many minutes longer does it take for him to walk a mile now compared to when he was a boy?
小提示：
比较两种速度对应的每英里分钟数
Compare the two paces in minutes per mile.
大提示：
先将 小时 分钟转换成分钟，再除以
Convert hours minutes to minutes before dividing by .
视频讲解：
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文字解答：
为了更容易比较速度，将它们都换成每英里所需分钟数。
小时候他跑 英里用了 分钟，所以速度为 分钟每英里。
现在他走 英里用了 分钟，所以速度为 分钟每英里。
相减得，现在他走一英里多花 分钟。
所以正确答案是 B。
To better compare the rates, we can change his speed into minutes per mile.
As a boy he ran miles in minutes, which means that he ran at a pace of minutes per mile.
As an adult, he can walk miles in minutes, which means he walks at a pace of minutes per mile.
Subtracting the two, we get that he takes more minutes to walk a mile as an adult.
Thus, B is the correct answer.
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