7 answers
(click or scroll down)
Start out at 7:37 -- warning bell
1st period -- 7:42-8:14
Passing time -- 8:14-8:19
2nd period -- 8:19-9:01
Passing time -- 9:01-9:06
etc.
I was giving 5 minutes for each passing time. If you get to 1:56 and it doesn't come out even, then adjust the passing time.
How do you add 42 minutes to any point in time?
7:42 + 42 = 7:84 >> 8:14 (Of course there are only 60 minutes in an hour, so carry that one hour to the 7 and include what's left for the minutes.)
Let us know what you come up with.