You can put this solution on YOUR website! Let 8:00 AM be and count all time in minutes.
11:00 would be ().
Let's say the time now is minutes after 11:00 AM or .
Two hours ago it was .
Two hours ago it was also , "three times as many minutes past 8 a.m."
So then,
It's now 11:30 AM.
Two hours ago it was 9:30 AM or 90 minutes after 8:00 AM.