If they're both on the same date, then they mark a period of 21/2 hours.
400 add 230 = 630
9 hours.
9 hours.
From 630 am to noon is 5.5 hours. From noon to 330 pm is 3.5 hours. Total =9 hours.
3
7 and a half hours
10.5 hours
There are 9 hours between 630 am and 930 am.
630 minutes.
8.5
8.5 hrs