Saturday, May 19, 2007


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?


Anonymous Anonymous said...


May 19, 2007 at 10:23 PM  
Anonymous Joseph said...

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).

May 21, 2007 at 7:34 AM  
Blogger steven said...

1/ At 1:05.45454545... to be really precise. There's an explanation here :- .

2/ The stopped clock is correct twice a day but the other clock is correct once every 12*60=720 days.

May 26, 2007 at 12:37 AM  

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