Why do hours go 11AM, 12PM, 1PM, and 11PM 12AM 1AM instead

MA TEACHING OF ENGLISH AS A SECOND LANGUAGE Semesters IV Day Time 9am- 10am 10am - 11am 11am- 12pm 12pm-1pm 2pm- 3pm

How many hours between 12am to 1pm? There are 13 hours from 12am to 1pm How many minutes between 12am to 1pm? There are 780 minutes from 12am to 1pm

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