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 Got a Minute? (Posted on 2003-09-10)
You have an infinite amount of timers, each is an hour long (they do not have dials on telling you how long they've been going - they just beep when the time is up). You can set it to double speed at any time, but you cannot set it back to normal speed (eg if you set it to double speed at the start it will last 30 minutes.

Using each timer only once, is it possible to time exactly 25 minutes?

If it is, what is the smallest number of timers you need to do this, and the quickest time you can acheive it?

 No Solution Yet Submitted by Lewis Rating: 3.6000 (15 votes)

 Subject Author Date No Subject frank 2005-06-19 19:44:28 Solution Oren 2004-04-23 16:00:50 Possible solution Oren 2004-04-23 15:07:39 To infinity and beyond! Mark Rees 2004-03-30 05:18:30 Impossible tan 2004-02-20 00:22:09 re: 2 timers??? Charlie 2004-01-28 22:12:53 2 timers??? dan thewlis 2004-01-28 19:17:14 time mike 2003-12-10 18:07:31 short and sweet Eric 2003-11-07 17:57:49 re: Tic Toc Brian Wainscott 2003-10-17 03:10:06 Tic Toc Alain 2003-10-16 19:36:27 re: double speed Brian Smith 2003-10-13 19:36:49 "double speed" TJ 2003-10-13 19:09:20 Solution Matthew 2003-10-09 17:22:33 Tick Tock goes the clock ... (Solution) Brian Smith 2003-10-06 14:30:02 re: Answer Brian Wainscott 2003-09-24 19:48:42 Answer kravix 2003-09-24 18:58:20 Ideas Dacre 2003-09-22 10:09:37 re(3): Closer and closer Brian Wainscott 2003-09-18 19:23:53 re(2): Got it - but you gotta be fast!!! Charlie 2003-09-18 16:14:02 re(2): Closer and closer Brian Smith 2003-09-18 14:31:49 re: Closer and closer Brian Wainscott 2003-09-18 13:44:30 re: Got it - but you gotta be fast!!! Brian Wainscott 2003-09-18 13:42:17 Got it - but you gotta be fast!!! Norfolk-n-Good 2003-09-18 11:09:56 Closer and closer Brian Smith 2003-09-16 10:01:39 re: just a thought AD 2003-09-11 14:35:57 just a thought FatBoy 2003-09-11 13:42:42 re: a start Brian Wainscott 2003-09-10 21:20:41 a start Charlie 2003-09-10 14:15:01 re(2): thoughts FatBoy 2003-09-10 12:42:38 re(2): thoughts Sam 2003-09-10 12:36:06 re: thoughts Brian Wainscott 2003-09-10 12:10:26 thoughts Charlie 2003-09-10 11:26:48 Thoughts Brian Smith 2003-09-10 11:26:06 Some thoughts Sam 2003-09-10 10:22:21

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