SBI PO 30 April 2017 Papers

person starts from Point A,walks 30 metre towards south and reaches Point B. He then takes a right turn, walks 7 metre, followed by a right turn,and walks for 6 metre. He then takes a right turn and walks 7metre. He takes a final left turn, walks a certain distance and reaches Point R. Point R is 17 metre to the north of Point B. What is the distance between Point A and Point R?