A problem with watches

A problem with watches

We have an analog clock that is delayed half a minute every day. Another clock of the same type instead stands.

Which will show the correct time more often?


The clock that is stopped will show the correct time twice a day. However, the clock that delays half a minute a day will take 2 × 60 × 12 = 1440 days to display the correct time, then the broken clock will mark the correct time more times.