Subtracting 9:55pm from 11:42pm gives 1 hour 47 minutes.
There are 6 hours of elapsed time between 9:00 AM and 3:00 PM.
18 minutes
About 30 minutes
3 hours 53 minutes
255
The elapsed time of 1 pm to 9 am is 20 hours.
2 hours, 22 minutes.
10 hours
1 hour and 40 minutes.
6 and 1/2 hours
6 hours.
Two hours elapsed time.