SBI PO 07 May 2017 Papers

A man walks 12 metre east from point A and reaches point B. From point B he takes left turn and walks 4 metre and then he takes right turn and walked 6 metre and again he takes right turn and walks 7 metre and again takes right turn and reaches point M. If it is given that point B is in north from point M, then what is the distance between B and M?