To find the total distance Arthur walked, I need to add the distances he walked east and north. The distance he walked east is six blocks times one-third of a mile per block, which is two miles. The distance he walked north is 12 blocks times one-third of a mile per block, which is four miles. So the total distance he walked is two miles plus four miles, which is six miles.


Arthur walks six blocks east and then 12 blocks north. If each block is one-third of a mile, how many miles did he walk?