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Got a Minute? (Posted on 2003-09-10) Difficulty: 3 of 5
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)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
No Subjectfrank2005-06-19 19:44:28
SolutionSolutionOren2004-04-23 16:00:50
Possible solutionOren2004-04-23 15:07:39
To infinity and beyond!Mark Rees2004-03-30 05:18:30
Impossibletan2004-02-20 00:22:09
re: 2 timers???Charlie2004-01-28 22:12:53
2 timers???dan thewlis2004-01-28 19:17:14
timemike2003-12-10 18:07:31
short and sweetEric2003-11-07 17:57:49
re: Tic TocBrian Wainscott2003-10-17 03:10:06
Tic TocAlain2003-10-16 19:36:27
re: double speedBrian Smith2003-10-13 19:36:49
"double speed"TJ2003-10-13 19:09:20
SolutionMatthew2003-10-09 17:22:33
SolutionTick Tock goes the clock ... (Solution)Brian Smith2003-10-06 14:30:02
Questionre: AnswerBrian Wainscott2003-09-24 19:48:42
Answerkravix2003-09-24 18:58:20
SolutionIdeasDacre2003-09-22 10:09:37
re(3): Closer and closerBrian Wainscott2003-09-18 19:23:53
re(2): Got it - but you gotta be fast!!!Charlie2003-09-18 16:14:02
re(2): Closer and closerBrian Smith2003-09-18 14:31:49
re: Closer and closerBrian Wainscott2003-09-18 13:44:30
re: Got it - but you gotta be fast!!!Brian Wainscott2003-09-18 13:42:17
Got it - but you gotta be fast!!!Norfolk-n-Good2003-09-18 11:09:56
Closer and closerBrian Smith2003-09-16 10:01:39
re: just a thoughtAD2003-09-11 14:35:57
just a thoughtFatBoy2003-09-11 13:42:42
Some Thoughtsre: a startBrian Wainscott2003-09-10 21:20:41
Some Thoughtsa startCharlie2003-09-10 14:15:01
re(2): thoughtsFatBoy2003-09-10 12:42:38
re(2): thoughtsSam2003-09-10 12:36:06
Some Thoughtsre: thoughtsBrian Wainscott2003-09-10 12:10:26
Some ThoughtsthoughtsCharlie2003-09-10 11:26:48
ThoughtsBrian Smith2003-09-10 11:26:06
Some thoughtsSam2003-09-10 10:22:21
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