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Number of miles

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Number of miles

by Deepthi Subbu » Sun Jan 09, 2011 1:34 am
A certain car averages 25 miles per gallon of gasoline when driven in city and 40 miles per gallon when driven in highway.According to these rates which of the following is closest to the number miles per gallon that the car averages when the car is driven 10 miles in the city and 50 miles on the highway.

1.28
2.30
3.33
4.36
5.38

OA36
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by Anurag@Gurome » Sun Jan 09, 2011 2:11 am
Deepthi Subbu wrote:A certain car averages 25 miles per gallon of gasoline when driven in city and 40 miles per gallon when driven in highway.According to these rates which of the following is closest to the number miles per gallon that the car averages when the car is driven 10 miles in the city and 50 miles on the highway.

1.28
2.30
3.33
4.36
5.38
Miles driven in city = 10 => Gallons of gasoline burned = (10/25)
Miles driven in highway = 50 => Gallons of gasoline burned = (40/50)

Total miles driven = (10 + 50) = 60
Total gallons of gasoline burned = (10/25) + (50/40) = (330/200) = (33/20)

Average miles per gallon = 60/(33/20) = (60*20)/33 = 36.36

The correct answer is D.
Anurag Mairal, Ph.D., MBA
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