Let the starting position be at origin (0,0) on a coordinate plane.
Ankit walks 3 km towards south:
Position: (0,−3)
He turns left (facing east now) and walks 6 km:
Position: (6,−3)
He turns towards north and walks 5 km:
Position: (6,2)
He turns towards west and walks 4 km:
Position: (2,2)
He further walks 2 km (continuing west):
Final Position: (0,2)
Distance from starting position (0,0) to final position (0,2):
d=(0−0)2+(2−0)2
d=0+4
d=4
d=2 km
Therefore, Ankit is 2 km from his starting position.