找回密码
 立即注册
搜索
总共850条微博

动态微博

查看: 7646|回复: 2
打印 上一主题 下一主题
收起左侧

Three clocks

[复制链接]

456

主题

1770

帖子

2万

积分

跳转到指定楼层
楼主
发表于 2004-11-4 22:58:29 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式

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?
www.ddhw.com

 
回复

使用道具 举报

0

主题

10

帖子

60

积分

沙发
发表于 2004-11-5 08:31:18 | 只看该作者

answer


July 18, 2004www.ddhw.com
 
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
www.ddhw.com

 
回复 支持 反对

使用道具 举报

456

主题

1770

帖子

2万

积分

板凳
 楼主| 发表于 2004-11-5 09:16:02 | 只看该作者

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?
www.ddhw.com

 
回复 支持 反对

使用道具 举报

24小时热帖
    一周热门
      原创摄影
        美食美文
          您需要登录后才可以回帖 登录 | 立即注册

          本版积分规则

          Archiver|手机版|珍珠湾ART

          Powered by Discuz! X3 © 2001-2013 All Rights Reserved