Directions: Attempt these questions based on the information given.
P, Q, R, and S are standing on four corners of a square piece of plot as shown in the given figure. They start moving and the movement is explained in each of the questions.
Q travelled straight to R. a distance of 10 km. He turned right and walked 7 km towards S. Again. he turned right and walked 8 and then finally turned right and walked 7 km. How far is he from his original position?