Marco is limited to 7 hours of screen time each week. He decides to watch a movie that is one hour and twenty minutes on Sunday.

Marco is limited to 7 hours of screen time each week. He decides to watch a movie that is one hour and twenty minutes on Sunday.  How much screen time will he have left after watching that movie?

7 - 1 20/60 hours = 5 40/60 hours, or 5 hours 40 minutes.