Ahmed walks 5 km south, then 12 km west. How far is he from his starting point, and in which direction?

  1. 13 km North-East
  2. 14 km South-West
  3. 13 km South-West
  4. 17 km South-West
Answer

C) 13 km South-West

Net east–west: -12 km, net north–south: -5 km. Distance = -12^2 + -5^2 = 13 km, towards the South-West.

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