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.
6 hours have been elapsed
The elapsed time of 1 pm to 9 am is 20 hours.
About 30 minutes
3 hours 53 minutes
Pm to Pm, 1 hour, 47 minutes (or 6,420 seconds).Am to Pm, 13 hours, 47 minutes (or 49,620 seconds).
255
1 hour and 40 minutes.
10:20
6 hours.
3 hours, 32 minutes
Between 1:30pm and 4:45pm there are 195 minutes .
594 minutes.
The answer is 6 hours.
899 minutes
There are 15 hours and 15 minutes between 5:15 am and 8:30 pm.
10 hours, 20 minutes
Nine hours, fifteen minutes