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What is it?
You are on the Glasgow underground (subway), travelling clock-wise. The journey time between Buchanan St. and St. Enoch is approximately 55 seconds. Hmmm. On the surface it’s downhill journey, down the busiest shopping street in Glasgow with 2 road crossings. Hmmm.
Challenge: Can you get off the a train at Buchanan St. and back on the same train the next time it stops at St. Enoch?
Rules: You can break the law if you wish.