Answer: 46200 feet per quart.
Explanation:
We know that 1 gallon = 4 quarts
1 mile = 5280 feet
Therefore , 5 gallons = 5 x 4 quarts
= 20 quarts (i)
175 miles = 175 x 5280 feet
i.e. 175 miles = 924000 feet (ii)
Now , 175 miles per 5 gallons =

[From (i)and (ii)]

Hence, 175 miles per 5 gallons = 46200 feet per quart.