Description
Lets image the equator of the Earth to be 40,000 kilometers long (in actual fact it is 40,075.16 kilometers!) and that the surface of the equator is perfectly flat.
I take a 40,000 kilometre piece of rope and tightly wrap it around the equator. There are no gaps and the two ends of the rope meet perfectly.
Puzzle
However, I don't want the rope to be tightly wrapped around the equator but be lifted 1 metre above the surface of the equator all the way around.
Clearly I will need more rope... how much extra rope will I need?
Check the solutions page for the correct answer.
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