Use two unit multipliers to convert 20 inches to miles

Step-by-step explanation:

I answered another one of your questions so I will not explain as much. ther are 12 inches in a foot and then 5280 feet in a mile so that's 1 ft / 12 in and 1 mi / 5280 ft. So the math is 20 in * 1 ft / 12 in * 1 mi / 5280 ft =.000315 mi.

In reference to the last one, do keep in mind "square" inches and whatnot mean you square things. so 1 ft / 12 in becomes 1 ft^2 / 144 in^2. Just as a small heads up to what could be tricky.