A limo driver does to two stops to pick up students going to their prom. He starts driving at point S on North Street, picks up a group of students at point A , then turns onto Maple Drive to pick up the second group of students at point B . After picking up the second group, he turns onto Education Lane, and takes them to the prom at point P . If Maple Drive intersects North Street and Education Lane at their midpoints, how far did the limo driver drive from point S to the prom?