Question

15. A car traveled east of Delhi by 100 Km and then to the west of it by 130 km. How far from Delhi was the car finally?
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Answer 1

If they traveled East 100 km, and then back West 130 km, they have traveled 30 km from where they originally were.

Another way to look at this problem is let's say that heading East is going forward positively. And going West is going backwards negatively. Our starting point is 0 (zero).

If they go East 100 km and then West 130 km, then they are going: 0 + 100 - 130 = -30.

Negative 30 is 30 km West.