On A 12 hour clock, it would be 12:30 am, or 12:30pm.
6 and 1/2 hours
20.5 hours.
3.5 hours.
1375
It is 4 hours.
Four
4
12:30 am in military/24 hour time is 0030 hours. NB 12:30 am is 30 minutes past midnight.
201/2 hours exactly.
1960
14 hours, and 30 minutes
It is 4 hours and 15 minutes.