A girl starts at point A and walks 7 km towards South, turns right and walks 5 km; turns another left and walks 1 km. She then takes a right turn and walk 4km; turns left and walks 2km. She then walks 2 km towards East and turns left and walks 10 km to reach B. How far is A from B?
1
11 km
2
6 km
3
7 km
4
9 km