You can
put this solution on YOUR website!
9:55 PM
-1:43
------
8:12 PM
---------------------------------------------------
Note: If it had finished at 9:20 PM you would have
needed to borrow 60 minutes from 9 o'clock and
considered 9:20 PM as 8:80 PM:
8:80 PM
-1:43
-----
7:37 PM
Edwin