There are 4 and 1/2 hours between 8:30 and 1.
2 pm
1 hour 34 minutes 0:30 + 1:00 + 0:04
7
ten and a half
There are 4 and 1/2 hours between 8:30 and 1.
2 pm
1 hour 34 minutes 0:30 + 1:00 + 0:04
7
ten and a half
8 hours.
Unless it's a 24-hour clock, then it means it's 1pm.
21 + 168*k hours, where k is any integer.
Nine and a half hours.
840
Nine hours.
4.5 hours