Displacement of a car

A car at point $$A$$ on a straight road goes west for $$20$$ seconds, arriving at point $$B$$ which is $$200$$ m away from $$A.$$ The car then heads back to the east for $$30$$ seconds, arriving at point $$C$$ which is $$800$$ m away from $$B.$$ What is the displacement of the car from point $$A$$?

Assume that $$+$$ is east and $$-$$ is west.

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