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Estimation question

A garden snail crawls once around the Earth at top speed without a break. How many years does it take?

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The answer

4,560 years

About 4,600 years. Had it set off when the pyramids were built, it would arrive about now.

How to get there

  1. Earth's circumference about 40,000 km = 40 million metres (assumption)
  2. ÷ 1 metre per hour = 40 million hours
  3. ÷ 8,766 hours per year ≈ 4,560 years

Source: University of Exeter, August 2013: garden snails reach up to 1 metre per hour

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