100 kilometers is equal to how many miles?

Sep 14, 2015

Using the Fibonacci sequence as a rough approximation:
$100 = 89 + 8 + 3$ so sum $55 + 5 + 2 = 62$

Explanation:

The ratio between miles and kilometres is close to the limiting ratio between successive terms of the Fibonacci sequence.

$1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 , 89 , \ldots$

So $5$ miles is about $8$ kilometres, $21$ kilometres is about $13$ miles, etc.