Description: Sal solves what time do you leave if you are traveling 39 minutes and need to be home at 6:15. Created by Sal Khan. If the trip home takes 39 minutes, at what time does Chris have to leave in order to be home by a quarter after 6:00? Well, it's going to be a quarter of the way between 6 and 7 o'clock. So this would be half of the way between 6 and 7 o'clock.*Teacher Advisor is 100% free.