1 hour and 15 minutes.
One hour, 15 minutes
The time from 0530 to 1230 is 7 hours. To calculate this, you can subtract 0530 from 1230: 1230 - 0530 = 0700, which equals 7 hours.
2 1/3
2 hours and 45 minutes.
12:45 pm
2300 INST
Two hours elapsed time.
1 hour, 35 minutes
00:30; a half hour after midnight
it will be 6:30 am of the same day
6 and 1/2 hours
1230 pm