Arsalan starts from his house and walks 7 km towards the south. He turns right and walks 4 km, and finally turns right again and walks 10 km. How far is Arsalan from the house now?
Correct answer B. 5 km
Explanation
Taking the house as the origin, the final position is 4 km west and 3 km north of it. The shortest distance is the square root of (4² + 3²), which is 5 km.
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