Discussion
A man goes 9 km east, then 4 km north, then 5 km west and finally 4 km south. How far is he from his starting point ?
Answer: C
Correct answer: 4 km
Treat the two axes separately.
\[\text{East-west} = 9 - 5 = 4 \text{ km east}, \qquad \text{North-south} = 4 - 4 = 0\]
He ends 4 km due east of where he began.
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