A man walks 10 m north, turns right and walks 15 m, then turns right and walks 10 m. How far is he from the starting point?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Explanation:
The man first moves 10 m north, then 15 m east, and then 10 m south. The north and south movements cancel each other, leaving him 15 m east of the start.