SSC JE Mechanical Engineering 2017 Set 1 Paper

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.