There are 2+12k hours where k is an integer.
5 hours
From 9:45 AM to 5 PM OR 9:45 PM to 5 AM... the answer is 7 hours and 15 minutes !
Round 7:30 am up to 8 am. 8am = 0800 and 5 pm = 1700 so from 8 am to 5 pm, it is 9 hours. There are thirty minutes left from 7:30 am to 8 am so there are 9.5 hours from 7:30 am to 5 pm.
7 hours
11:25pm to 7:40am is 8 hours and 15 minutes.
5.5 hours
7 and a half hours
If one is am and the other is pm, there are 7 hours in this period. If they are both am or pm, there are 5 hours in this period.
7am to 5:40pm is 10 hours and 40 minutes.
10 hours.
7