Answer : The distance travel on a full tank of gas is 450 mile.
Explanation :
As we are given the car has 15 gal tank and their average is 30 mi/gal. Now we have to calculate the distance they can travel on a full tank of gas.
In 1 gal tank they can travel = 30 mile
In 15 gal tank they can travel =

= 450 mile
Hence, the distance travel on a full tank of gas is 450 mile.