A8. If you walk to school and get back home by car, it takes you 3.5 hours for the round trip from home to school and back. If you drive both ways, it takes 1 hour. How long does it take if you walk to school and back?
(A) 4.5 hours
(B) 1 hour
(C) 6 hours
(D) 7 hours
(E) 8 hours