1960 AMC 12 第 2 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。
2.
一只钟从恰好 开始敲响 下，共用 秒。若每相邻两次敲响的时间间隔相同，那么敲响 下需要多少秒？
It takes seconds for a clock to strike o’clock beginning at o’clock precisely. If the strikings are uniformly spaced, how long, in seconds, does it take to strike o’clock?
以上都不是
none of these
小提示：
敲响六下只包含五个时间间隔
Six strikes contain only five time intervals
大提示：
敲响十二下包含十一个同样长的时间间隔
Twelve strikes contain eleven intervals of the same length
解答：
从 下中的第一下到最后一下共有 个相等的时间间隔，所以每个间隔为 秒。敲响十二下共有 个这样的间隔，因此需要 秒。
因此，正确答案是 C。
There are equal intervals from the first of strikes to the last, so each interval lasts second. Twelve strikes contain such intervals and therefore take seconds.
Thus, the correct answer is C.
其他年份的第 2 题
- 1950 AMC 12
- 1951 AMC 12
- 1952 AMC 12
- 1953 AMC 12
- 1954 AMC 12
- 1955 AMC 12
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- 1958 AMC 12
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