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by baliex
676 days ago
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That one’s useful too. If you know a few Fibonacci numbers you can convert miles to kilometres and vice versa with ease. 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 … 21 km is ~13 miles, 13 km is ~8 miles, etc. A 26 mile marathon? Must be ~42km. Same for speed limits too; 34 mph is ~55 kmh |
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