The average gas mileage of Roys car is 36 miles per gallon of gas for highway driving

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The average gas mileage of Roy’s car is 36 miles per gallon of gas for highway driving and 24 miles per gallon of gas for city driving. If Roy used 10 gallons of gas for driving 340 miles on both highways and cities, how many miles did he drive on highways?
A) 240
B) 260
C) 280
D) 300

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