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A walker goes 3 km North, then 4 km East. His distance from the start is:
A$7$ km
B$5$ km
C$1$ km
D$25$ km
Answer & Solution
Correct answer: B. $5$ km
Pythagorean: √(3² + 4²) = √25 = 5 km. Classic 3-4-5 triangle.
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