A man starts from A, walks 10 metres along north, turns right and walks 18 metres, turns left and walks 12 metres, again turn left and walks 18 metres. If his final position is at B, the distance between A and B is
A cyclist goes 40 km towards East and then turning to right he goes 40 km. Again he turn to his left and goes 20 km. After this he turns to his left and goes 40 km, then again he turns right and goes 10 km. How far is he from his starting point?