8. John takes 40 minutes to walk to school and then to run home. When he runs both ways, it takes him 24 minutes. He has one fixed speed whenever he walks, and another fixed speed whenever he runs. How long would it take him to walk both ways?
A 56 minutes
B 50 minutes
C 44 minutes
D 28 minutes
E 24 minutes
8. A It takes John 24 minutes to run both ways so it will take him $\frac{1}{2} \times 24$ minutes $=12$ minutes to run one way. Also, it takes him 40 minutes to walk one way and run the other so walking one way takes him $(40-12)$ minutes $=28$ minutes. Hence it will take $2 \times 28$ minutes $=56$ minutes to walk both ways.