2 hours, 22 minutes.
6 hours.
2 hours 25 minutes
1030 pm CDT
I do it in two parts. I calculate how much time has elapsed between the AM and noon, then how much time has elapsed between noon and the PM, then add them together.
18 minutes
6 hours have been elapsed
255
10 minutes.
The elapsed time of 1 pm to 9 am is 20 hours.
* *
10 hours