Concept:Track the net displacement by summing the vector movements.Explanation:Start at (0,0).1. 30 m North: (0,30).2. Right (East) 40 m: (40,30).3. Right (South) 20 m: (40,10).4. Right (West) 40 m: (0,10).Final point is (0,10). Distance from origin = 10 m.Answer:10 metres