Question

Rita goes $20km$ towards east from a point A to the point B. From B, she moves $30km$ 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?

Answer 1

Distance travelled towards $east$ is represented with a positive integer so it should be $20km$.

As west is opposite to east so distance in the direction of $west$ will be represented by $negative$ integer so distance along west is $-30km$.

The final position will be net displacement $=20+(-30)=-10km$, as it is $negative$ so it shows that finally, Rita is in the west to its initial position.