Question

An insect flies 20 feet in 1 second. how fast does the insect fly in miles per hour?

Answer 1

$\frac{20 ft}{sec} ( \frac{60 sec}{min} )( \frac{60 min}{hr})( \frac{1 mi}{5280 ft})$

All of the units cancel other than miles divided by hours which is what we need.

Now we do (20 * 60 * 60 * 1) / 5280 which is 13.636363 (repeating) or 13.6364 miles per hour.