Final answer:
The cost of the delivery truck for a distance between 1 mile and 2 miles is $6 due to the fixed base price.
Step-by-step explanation:
The cost of the delivery truck for traveling a distance between 1 mile and 2 miles is a fixed base price. Since the delivery truck driver charges a fixed base price of $6 for 2 miles, this fixed rate applies regardless of whether the distance is 1 mile or 2 miles. Therefore, the cost remains $6 even if the delivery is only for 1 mile.