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Rita goes 20 km towards east from a point A to the point B. From B, she moves 30 km towards west along the same road. If the distance towards east is represented by a positive integer then, how will you represent the distance travelled towards west? By which integer will you represent her final position from A?

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According to the number line, Rita moves towards east is represented by a positive integer.

But she moves in opposite direction means Rita moves west, is represented by negative integer.

Distance from A to B = 20 km

Distance from B to C = 30 km 

Distance from A to C = 20 – 30 = –10 km 

Thus, Rital is at final position from A to C is –10 km.

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