Mr smith is walking his dog. He walks for 5 minutes at a speed of 1.5 m/s. His dog runs at a speed of 5 m/s for the same time. How far does Mr Smith walk?

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .