Chintan walked 15 km west, turned left and walked 20 km, then moved east and walked 25 km, and finally turning left covered 20 km. How far is he from his starting point?

He is 10 km from the starting point.

West 15 gives (-15,0).

A left turn faces south; 20 km gives (-15,-20).

East 25 gives (10,-20).

A left turn faces north; 20 km gives (10,0).

The distance from (10,0) to the origin is 10 km.