eight and a half hours
16.5 + 24*k hours where k is any integer.
It is 1500 hours
930
6 hours and 30 minutes
15.00hrs
noon
4 pm
8:30 6:30 to 12:00 = 5:30 12:00 to 3:00 = 3:00 Total 8:30 or 15:00 - 6:30 = 8:30
7:30am 3:00pm = 15:00 hours on 24 hour clock 15/2 = 7.5 60 x 0.5 = 30
12:59 pm EST
If it were 3:00pm it would be 4:00am in Australia. If it were 3:00am it would be 4:00pm in Australia.