Write a real-world problem that can be represented by a linear function. Explain the function rule and give a reasonable domain and range.

Suppose the gas tank in Zack's car holds 20 gallons of gas, and the car gets 32 miles per gallon. Zack fills up his tank with gas, and heads out on a trip. His distance (D) traveled on one tank of gas can be represented by the function D (x) = 32x, where x is the number of gallons of gas he used.