Answer: Mr. Hall's miles per gallon for the driving period was 15.
Explanation:
The distance Mr. Hall traveled between filling up his tank and running out of gas is:
10,411 - 10,111 = 300 miles
His miles per gallon (MPG) can be calculated by dividing the distance traveled by the amount of gas used:
MPG = distance / gas used
Since he used 20 gallons to fill up his tank, we have:
MPG = 300 miles / 20 gallons
MPG = 15 miles per gallon
Therefore, Mr. Hall's miles per gallon for the driving period was 15.