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Let us sketch a diagram to better understand the problem.
A runner runs 10 m from the origin toward the WEST to point A.
He then runs from point A 20 m more toward the WEST to point B.
He then runs from point B 30 m more toward the EAST to point C.
So, now we have to reverse the direction and run 30 m
The distance from the origin to the point B was 20m + 10m = 30m
Then he reversed the direction and covered a distance of 30m
So, 30m - 30m = 0m
Therefore, the runner's total displacement from the origin to point C is 0 m