Add km-to-miles

snippets/km_to_miles.md

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+---
+title: km_to_miles
+tags: math,beginner
+---
+
+Converts kilometers to miles.
+
+- Follows the conversion formula `mi = km * 0.621371`.
+
+```py
+def km_to_miles(km):
+  return km * 0.621371
+```
+
+```py
+km_to_miles(8.1) # 5.0331051
+```