CA Foundation · Quantitative Aptitude · Direction Tests
Starting from a point A, Sanjay walks 9 km south, then 12 km west, then 9 km north. How far is he from A and in which direction?
He is 12 km west of A. The 9 km walk south is exactly undone by the 9 km walk north, so the only net displacement is the 12 km westward leg. Hence the shortest distance is 12 km and the direction is west.
- A12 km, westCorrect
- B18 km, west
- C15 km, south-west
- D12 km, east
Explanation
The 9 km south and 9 km north cancel each other out. Only the 12 km west displacement remains. So he is 12 km west of A. The 15 km option wrongly applies Pythagoras to 9 and 12 without cancelling the opposite legs.
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