Movie started at 2:35 and lasted 1 hr 45 mins.
You know there are 60 mins in an hour.
Simple math: 2:35 pm is written as 2 hrs 35 mins
2 hrs 35 mins
+ 1 hr 45 min
3 hrs 80 mins convert 80 mins into 1 hr 20 mins for a total of
4 hrs 20 mins or 4:20 pm