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
A8. For both directions by car, you need 1 hour, for one direction, you need 0.5 hours. Therefore, for one direction on foot, you need $3.5-0.5=3$ hours, for both directions, 6 hours.