From 9 AM to 3:40 PM is a duration of 6 hours and 40 minutes. To break it down, from 9 AM to 3 PM is 6 hours, and then adding the additional 40 minutes results in a total of 6 hours and 40 minutes.
12 hours.
From 9am to 6:30pm is 9 hours and 30 minutes.
21
5 Hours
21 hours
6 hours
There are zero hours between 9 am and 9 am.
11 hours
4 hours. 9am until noon is 3 hours and 1 more makes 4.
5.7
21
Twelve hours