Correct Answer: Option B
Explanation:
Assuming they start at x=0 and x=20 facing inwards. A goes 5 East (x=5), turns left (North) 10 (y=10), turns left (West) 5 (x=0, y=10). B goes 5 West (x=15), turns right (North) 10 (y=10), turns left (West) 5 (x=10, y=10). A is at (0, 10), B is at (10, 10). The distance is 10 km.
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