Can you guide me through solving this problem: Justin wanted to watch a movie that came on at 8 pm that night.  His parents agreed as long as he finished his homework and chores before the movie started.  He wouldn't be home until 5 pm because of baseball practice.  He knew dinner would take 45 minutes, and he figured his homework would take 30 minutes to finish.  He needed to clean his room, which would take 30 minutes; then take out the trash, which would take about 5 minutes; and empty the dishwasher,  which would take another 10 minutes.  What was the latest time that Justin could start his chores and homework to be done by 8 pm to watch his movie?