Clocks
1/ The hour and minute hands of a clock are superimposed at 12:00. When will they next be superimposed (I don't mean lined up as they are at 6:00)?
2/ Which has a better chance of giving the right time: a clock that has stopped or one that loses a minute every day?
posted by steven | 10:00 PM
3 Comments:
1:06
2) The stopped clock.
It's right twice a day, but the other clock will only give the right time every 720 days (12 * 60).
1/ At 1:05.45454545... to be really precise. There's an explanation here :- http://www.jimloy.com/puzz/clock1.htm .
2/ The stopped clock is correct twice a day but the other clock is correct once every 12*60=720 days.
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