Which clock works best?
The one that does not work because it shows the correct time atleast twice a day!
A clock that runs one minute slow, would give the correct time once in 720 (12*60) days.
In a day the probability of it being correct is 1/ 3600,
therefore, the clock will be correct once in [12*3600/60] days.
The clock that is calculably slow is as good as a perfect one. You only need to know the date that it was set to the correct time. From that you can deduce the current correct time.
The clock that is broken has no value. True, it is correct twice a day, but we have no idea what those times are. Useless.
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