According to the diagram, the postman was in the ‘A’ place first. Then 4 km walks west and reaches ‘B’. Then 7 km goes in the south direction and reaches ‘C’. Then 4 km moves in the east direction and reaches ‘D’. Then 10 km walks north and reaches ‘E’. According to Diagram. BC ∥ AD or BC = AD ⇒ AE = DE – AD = DE – BC = 10 – 7 = 3 km Hence Postman, 3 km. North from the starting position.