一道数学应用题~~意思好象不怎么明白

chunk6278 · 发表于 2010-1-4 13:46:30

A certain clock marks every hour by striking a number of times equal to the hour and the time required for a stroke is exactly equal to the time interval between the beginning of the first stroke and the end of the last stroke is 22 seconds. At 12:00 , how many seconds elapse between the beginning of the first stroke and the end of the last stroke?

A 72 B 50 C 48 D 46 E 44

caixinni · 发表于 2010-1-4 13:55:38

是不是少了条件。。。这个22秒是在几点的时候敲的啊？

caixinni · 发表于 2010-1-4 13:57:41

找到了一个讨论贴楼主的题目里面果然少了条件啊。At 6:00 the time lapse between the beginning of the first stroke and the end of the last stroke is 22 seconds.

讨论贴地址：http://www.urch.com/forums/gmat-problem-solving/50649-clock-marks-power-prep.html

chunk6278 · 发表于 2010-1-4 14:05:37

.... 是at 6:00我漏打了...

caixinni · 发表于 2010-1-4 14:12:50

就是说每到整点的时候钟就会敲敲一声的时间和每两声中的时间间隙是相等的我们假设这个时间是x秒。
那么6点的时候可以得到方程：6x+5x=22 得x=2

而12点的时候是 12x+11x 得46

一道数学应用题~~意思好象不怎么明白

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