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wu :: forums    riddles    suggestions, help, and FAQ (Moderators: Icarus, towr, SMQ, Grimbal, william wu, Eigenray, ThudnBlunder)    help « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: help  (Read 1069 times) aparna Newbie     Posts: 1 help   « on: Jul 15th, 2006, 10:18pm » Quote Modify In a 12 hour clock,how many times do the hour hand and the second hand overlap?? IP Logged towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: help   « Reply #1 on: Jul 16th, 2006, 11:17am » Quote Modify I'll go with .719. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB rmsgrey Uberpuzzler     Gender: Posts: 2874 Re: help   « Reply #2 on: Jul 18th, 2006, 8:34am » Quote Modify And a simple explanation for why I get the same answer as Towr (taken per 12 hour period):   hidden: In 12 hours, the second hand goes round exactly 720 times (60 times per hour times 12 hours) In 12 hours, the hour hand goes round exactly once Since they both go round the same way, the second hand has to overtake the hour hand 719 times   Of course, if you start or finish at a time when the hands overlap, you can introduce fencepost errors. IP Logged Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy   - medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math) => suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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