0
Anonymous
If they're both on the same date, then they mark a period of 21/2 hours.
400 add 230 = 630
9 hours.
3
10.5 hours
7 and a half hours
There are 9 hours between 630 am and 930 am.
8.5
8.5 hrs
630 minutes.
11 hours and 45 minutes.