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Answer: 2400 m (= 2.4 km)
1 to 3: 2 gaps, 600 m
1 to 9: 8 gaps, 600$\times$4 = 2400 m
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Age 11 to 14
ShortChallenge Level 
Answer: 2400 m (= 2.4 km)
1 to 3: 2 gaps, 600 m
1 to 9: 8 gaps, 600$\times$4 = 2400 m
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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