Merge pull request #832 from Qo2770/master

[FEATURE] Add Kilometers/Hour to Miles/Hour conversion and reverse

snippets_archive/kmphToMph.md

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+### kmphToMph
+
+Convert kilometers/hour to miles/hour.
+
+Multiply the constant of proportionality with the argument.
+
+```js
+const kmphToMph = (kmph) => 0.621371192 * kmph;
+```
+
+```js
+kmphToMph(10); // 16.09344000614692
+kmphToMph(345.4); // 138.24264965280207
+```

snippets_archive/mphToKmph.md

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+### mphToKmph
+
+Convert miles/hour to kilometers/hour.
+
+Multiply the constant of proportionality with the argument.
+
+```js
+const mphToKmph = (mph) => 1.6093440006146922 * mph;
+```
+
+```js
+mphToKmph(10); // 16.09344000614692
+mphToKmph(85.9); // 138.24264965280207
+```