X drives 30 km south, then turns right and drives 30km, then turns left and drives 20 km and then turns left and drives 30 km. How far is X from his/her initial position?
P, Q, R, S & T are sitting in a straight line facing North. P sits next to S but not to T. Q is sitting next to R who sits on the entrance left corner. Who sits to the left of S if T does not sit next to Q?