https://www.gkbymrdj.com/a-man-walks-2-km-towards-north-then-he-turns-to-east-and-walks-10-km-after-this-he-turns-to-north-and-walks-3-km-again-he-turns-towards-east-and-walks-2-km-how-far-is-he-from-the-starting-point/