Sachin walks 20 km towards North. He turns left and walks 40 km. He again turns left and walks 20 km. Finally he moves 20 km after turning to the left. How far is he from his starting position?
A. 20 km.
B. 30 km.
C. 50 km.
D. 60 km.
Required distance = 40 - 20 = 20 km.
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