Here are some computations about time:
There are 60 seconds in a minute.
There are 60 minutes in an hour.
There are 24 hours in a day.
There are 365-366 days in a year.
There are 10 years in a decade.
There are 10 decades in a century.
There are 10 centuries in a millennium.
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30 minutes equal half an hour.
60 minutes equal one hour.
40 minutes = 2/3 of an hour
255 minutes.
30 minutes = half an hour, because 60 minutes are one hour.