13. Two brothers, Aaron and James, who are searching for buried treasure start underneath the
same tree. Aaron walks 12 m east and then 12 m north, while James walks 15 m west and
then 10 m south. Both of them stop at their respective locations. Find the magnitude and
direction of the vector from Aaron to James. Express the direction of this vector by specifying
the angle it makes with the west-to-east direction.