Jeremiah is riding in a car that is traveling 60 miles per hour. At this rate, how many minutes will it take him to travel 20 miles?
Distance equals rate times time, so the trip will take $$\frac{20\text{ mi.}}{60\text{ mph}}=\frac{1}{3}\text{ hours}.$$  One-third of an hour is $\boxed{20}$ minutes.