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标题: Three clocks [打印本页]

作者: ob 时间: 2004-11-4 22:58
标题: Three clocks

Gomzi has 3 timepieces in his house - a wall clock, an alarm clock and a wristwatch. The wristwatch is always accurate, whereas the wall clock gains 2 minutes everyday and the alarm clock loses 2 minutes everyday.

At exactly midnight last night, all three watches were showing the same time.

If today is 25 July 2003, then on which date all three clocks will show the same time again?

作者: ac_x 时间: 2004-11-5 08:31
标题: answer

July 18, 2004

total minutes of a day: 60x24 = 1440

since next time 3 clocks gonna meet is gonna be midnoon.

so 1440 / 2 / 2 = 360 days.

since year of 2004 is an even year.

then its gonna be july 18th :D

作者: ob 时间: 2004-11-5 09:16
标题: Good analysis.

One thing, the alarm clock should tell the difference between AM and PM. So, it should take 1440/2=720 days for the three clock to meet again. Is that right?

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