From point $A$, Leigh walked 40 yards south, 60 yards west, 10 yards north, and 20 yards east to point $B$. What is the length, in yards, of $\overline{AB}$?
40 south, 60 west 10 north, 20 east totals to
30 south, 40 west
√302+402 = 50
so the answer is 50
