2006 AMC 8 第 3 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
3.
Elisa 在泳池里游圈。刚开始时，她用 分钟游完 圈。现在她能用 分钟游完 圈。她每圈用时减少了多少分钟？
Elisa swims laps in the pool. When she first started, she completed laps in minutes. Now, she can finish laps in minutes. By how many minutes has she improved her lap time?
答案：A
小提示：
分别求 Elisa 改进前和改进后的每圈分钟数。
Find Elisa’s minutes per lap before and after the improvement.
大提示：
比较 分钟每圈和 分钟每圈。
Compare minutes per lap with minutes per lap.
解答：
起初 Elisa 每圈用 分钟。现在她每圈用 分钟。
因此每圈用时减少 分钟。
所以正确答案是 A。
Initially, Elisa swam one lap in minutes. Now she swims one lap in minutes.
Therefore, she improved her lap time by minute.
Thus, A is the correct answer.
其他年份的第 3 题
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