There are 1760 x 3 x 12 = 63360 inches in one mile. Therefore, 2.1 miles is equal to 2.1 x 63360 = 133056 inches.
21 miles is exactly 21 miles long or if you prefer 36960 yards long. 21 miles is also 110880 feet long and 1,330,560 inches long.
The Imperial gallon, which is used in Canada, is about 277.42 cubic inches. In contrast. the US gallon is 231 cubic inches.351 miles/21 US gallons * 1 US gallon/231 cubic inches * 277.42 cubic inches/Canadian gallon = 20.07 miles per Canadian Gallon
21 inches is 53.34 centimeters.
21 centimeters = 8.26771654 inches.
21 meters = 826.771654 inches
30 miles = 1,900,800 inches.
183,744 inches are in 2.9 miles.
101,376 inches are in 1.6 miles.
158400 inches.
152,064 inches are in 2.4 miles.
21. (7x3=21)
21 inches = 0.5833... recurring yards.