Oliver departs from his office and walks 20 m towards north. He then turns…

Oliver departs from his office and walks 20 m towards north. He then turns left and walks 50 m. He turns left again and walks 40 m. He then turns right and walks 10 m. How far is he from a pole which is exactly 60 m west of his office? (Assuming that all turns are 90 degree turns only.)