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
+```

test/kmphToMph/kmphToMph.js

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+const kmphToMph = (kmph) => 0.621371192 * kmph;
+module.exports = kmphToMph;

test/kmphToMph/kmphToMph.test.js

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+const expect = require('expect');
+const kmphToMph = require('./kmphToMph.js');
+
+test('kmphToMph is a Function', () => {
+  expect(kmphToMph).toBeInstanceOf(Function);
+});
+test('Returns mph from kph.', () => {
+  expect(kmphToMph(10)).toBe(6.21371192);
+});

test/mphToKmph/mphToKmph.js

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+const mphToKmph = (mph) => 1.6093440006146922 * mph;
+module.exports = mphToKmph;

test/mphToKmph/mphToKmph.test.js

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+const expect = require('expect');
+const mphToKmph = require('./mphToKmph.js');
+
+test('mphToKmph is a Function', () => {
+  expect(mphToKmph).toBeInstanceOf(Function);
+});
+test('Returns kph from mph.', () => {
+  expect(mphToKmph(10)).toBe(16.09344000614692);
+});