Mohan walks 20 meters north, then turns left and walks 10 meters. Then he turns right again and walks 20 meters. From here he turns right again and walks 10 meters. How far is he from his starting point now?

Explanation

Diagram showing Mohan's destination path forming a rectangle with dimensions 20m and 10m, starting at 'Starting Point' and ending at 'Ending Point' $\therefore$ The distance between the starting point and the ending point = $20 + 20$ $= 40 meters$