Because 12 is 3 times as large as 4, that means that the distance traveled in this time will be 3 times as large as the distance traveled in 4 minutes. This is 3/4 * 3 = 2.25 miles. The same goes for 20 minutes, only it is 5 times bigger, and therefore the distance traveled is 3/4 * 5 = 3.75 miles. Hope this helps!
