Bus Route

'Bus Route' printed from https://nrich.maths.org/

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.