The distance between Omaha and Lincoln is 60 miles. John drives a car that gets 30 miles per gallon of gas, and David drives a car that gets 20 miles per gallon. How many more gallons of gas does David use on a round trip from Omaha to Lincoln?
Correct answer: A
Explanation
Ratio of John Car efficiency : David Car efficiency = 30:20
Round trip takes 120 miles. Hence converting any one of the base for 120 = 180:120
Means if David travel 120 miles for the same gallons Omaha travled 180 miles. The gallon required to travel extra 60 miles is
Hence = 60/30 = 2
A
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