13 hours.
If you work from 10 AM to 6 PM, that totals 8 hours. After subtracting the 30-minute lunch break, you worked for 7.5 hours.
From 9:30 AM to 6 PM is a total of 8.5 hours. If you take away one hour for lunch, that leaves you with 7.5 hours of work time.
6
2 hours.
6 hours.
There are 10 + 24n hours where n is an integer
There are 14 hours between 6 am and 8 pm.
Two hours.
From 6:00 am to 3:00 pm is 9 hours.
There are 5 hours from 1 PM to 6 PM. You can calculate this by subtracting 1 from 6, which gives you 5.
The time from 6 AM to 11 PM is 17 hours. To calculate this, you can count the hours from 6 AM to 6 PM, which is 12 hours, and then add the 5 hours from 6 PM to 11 PM. Thus, 12 + 5 equals 17 hours.
5.75