8 hours and 15 minutes.
6 and 1/2 hours
1:45 plus 15 minutes gives us 2:00 pm. It is nine hours from 2:00 to 11:00 pm. Then we have 23 more minutes we can add to the first 15 for 38 minutes. 9 hours and 38 minutes is the elapsed time.
255
10:51 - 8:30 = 2:21 24 hours - 2:21 = 21 hours, 39 minutes
2 hours, 22 minutes.
There are 15 hours and 15 minutes between 5:15 am and 8:30 pm.
About 30 minutes
6 and 1/2 hours
5hrs 40 mins
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.
1:45 plus 15 minutes gives us 2:00 pm. It is nine hours from 2:00 to 11:00 pm. Then we have 23 more minutes we can add to the first 15 for 38 minutes. 9 hours and 38 minutes is the elapsed time.
18 minutes
6 hours have been elapsed
255
10:51 - 8:30 = 2:21 24 hours - 2:21 = 21 hours, 39 minutes
The elapsed time of 1 pm to 9 am is 20 hours.
2 hours, 22 minutes.