From 9 AM to 5:30 PM is a total of 8.5 hours. This includes 8 hours from 9 AM to 5 PM, plus an additional 30 minutes from 5 PM to 5:30 PM.
8 hours.
8 hours.
9
9 hours
Nine hours.
8 hours, 45mins
Four hours and thirty minutes.
one hour
(6.5+12k) hours where k is an integer.
11hrs 30 minutes
12 hours.
21