2:45 p.m- 6:15pm is about how many hours worked

From 1:30pm-2:15pm Is 75 minutes? I added 60 plus 15 If I'm wrong, please explain

A man set out at 12.15pm to visit his son at school 175 km away.If he travels at an average speed o...

A circus show started at 6:15pm and ended at 9:30 pm. How long was the show