A certain military vehicle

A certain military vehicle can run on pure Fuel X, pure Fuel Y, or any mixture of X and Y. Fuel X costs $3 per gallon; the vehicle can go 20 miles on a gallon of Fuel X. In contrast, Fuel Y costs $5 per gallon, but the vehicle can go 40 miles on a gallon of Fuel Y. What is the cost per gallon of the fuel mixture currently in the vehicle's tank?

(1) Using fuel currently in its tank, the vehicle burned 8 gallons to cover 200 miles.
(2) The vehicle can cover 7 and 1/7 miles for every dollar of fuel currently in its tank

How can i determine the best option?

OA D

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