What's the total distance covered? What is the magnitude and direction of her resultant displacement?

Question

A girl delivering newspapers travels three blocks west, four blocks north, three blocks east then 7 blocks south.  

Answer 1

Analyze the east west components separately from the north south components. Three blocks east and three blocks west cancel each other out, so the net movement east and west is 0. Net movement north and south is 7 - 4 = 4 blocks south. So the net resultant displacement is 4 blocks south.