Re: [計量] A certain clock marks every hour by ...
※ 引述《a0939327899 (噢)》之銘言：
: A certain clock marks every hour by striking a munber of times equal to
: the hour, and the time required for a stroke is exactly equal to the time
: interval between strokes. At 6:00 the time lapse between the beginning of
: the first stroke and the end of the lapse stroke is 22 seconds. At 12:00,
: how mant 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
: Ans:D
: 看了幾次實在想不通..
: 請大家幫我解答一下吧!!
: 感謝!
A certain clock marks every hour by striking a munber of times equal to
the hour
->有一個時鐘會用聲響的次數報時
time required for a stroke is exactly equal to the time
interval between strokes
->一個聲響所需要的時間和兩個聲響間的間隔時間是一樣的
所以6點的時候,要有6個聲響,6個聲響有5個間隔
假設一個聲響所需的時間為x
6x+5x=11x=22(sec) x=2
故12點的時候,要有12個聲響,12個聲響有11個間隔
(12+11)*2=23*2=46
應該是這樣吧XD
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12/28 23:32, , 1F
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