A man is standing in the park facing North. He turns to $$90^{\circ}$$ towards the left and walks 40 km. He again takes a $$90^{\circ}$$ turn towards the right and walks 50 km. He takes the next 90° turn towards the right and walks 60 km. Lastly, he takes $$90^{\circ}$$ tum towards the right and walks 50 km. How much distance is he from the starting point?

A

40 km

B

60 km

C

50 km

D

20 km