The Fibonacci sequence can be used to quickly estimate miles in kilometers.
The sequence is formed by adding the previous two numbers:
1, 1, 2, 3, 5, 8, 13, 21, 34, …
For example:
5 miles ≈ 8 kilometers
8 miles ≈ 13 kilometers
13 miles ≈ 21 kilometers
21 miles ≈ 34
Life is nonlinear.
So handle it using Math.

