To convert miles to inches, you need to multiply the number of miles by the number of feet in a mile and then multiply that number by the number of inches in a foot.
There are 5,280 feet in a mile, and there are 12 inches in a foot. So, to convert 12 miles to inches, you would multiply 12 by 5,280 to get 63,360 feet. Then, you would multiply 63,360 by 12 to get 792,000 inches.
Therefore, 12 miles is equal to 792,000 inches.