Use/convert the times to the 24 hour clock notation and simply subtract the two to get the answer.
In 24 hour notation
7.30 am = 0730 hours
4.30 pm = 1630 hours
1630-0730=0900 = 9 hours
From 9:30 pm to 12:00 am is 2.5 hours, then from 12:00 am to 7:00 am is 7 hours. Therefore, the total hours from 9:30 pm to 7:30 am is 2.5 + 7 = 9.5 hours.
9 hours and 30 minutes.
7
6
Ten hours.
8 hours.
5 hours and 30 minutes.
10 hours and 15 minutes.
10 hours and 45 minutes.
12 hours 30 minutes.
5.5
1 hour, 10 minutes