It took Samantha 20 min to skate over to her friend's house. She hung out there for 2 hours. On the way home, she stopped for 30 minutes to eat at McDonald's. If Samantha got home at 6:00pm, what time did she leave to go to her friend's house?

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours