Amir can travel 121.72 miles on 6.8 gallons of gas.

How far can Amir travel on 1 gallon of gas?

A.

171.9 miles

B.

17.9 miles

C.

6.8 miles

D.

1.79 miles

The unit consumption of gas can be obtained by dividing the total distance traveled in miles by the total gallons of gas consumed by the trip. This is shown below:

121.72 miles / 6.8 gallons = 17.9

Therefore, on a gallon of gas, Amir can travel 17.9 miles, which is letter B among the choices.