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## GMAT PREP PS question

alex.gellatly GMAT Destroyer!
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GMAT PREP PS question Mon Apr 16, 2012 1:11 am
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• Lap #[LAPCOUNT] ([LAPTIME])
At a speed of 50 miles per hour, a certain car uses 1 gallon of gasoline every 30 miles. If the car starts with a full 12 gallon tank of gasoline and travels for 5 hours at 50 miles per hour, the amount of gasoline used would be what fraction of a full tank?

A) 3/25
B) 11/36
C) 7/12
D) 2/3
E) 25/36

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killer1387 GMAT Destroyer!
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Mon Apr 16, 2012 1:17 am
alex.gellatly wrote:
At a speed of 50 miles per hour, a certain car uses 1 gallon of gasoline every 30 miles. If the car starts with a full 12 gallon tank of gasoline and travels for 5 hours at 50 miles per hour, the amount of gasoline used would be what fraction of a full tank?

A) 3/25
B) 11/36
C) 7/12
D) 2/3
E) 25/36

in 5 hrs distance travelled= 5* 50= 250 miles
now every 30 miles 1 gallon is used; hence no. of gallons used now = 250/30

required fraction = 250/(30*12)= 25/36

hence E

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### GMAT/MBA Expert

Anurag@Gurome GMAT Instructor
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Mon Apr 16, 2012 3:53 am
alex.gellatly wrote:
At a speed of 50 miles per hour, a certain car uses 1 gallon of gasoline every 30 miles. If the car starts with a full 12 gallon tank of gasoline and travels for 5 hours at 50 miles per hour, the amount of gasoline used would be what fraction of a full tank?

A) 3/25
B) 11/36
C) 7/12
D) 2/3
E) 25/36

Distance = speed * time
Distance = 50 miles
Time = 5 hours
Distance traveled by car per hour = 5 * 50 = 250 miles
So, the care will use 250/30 = 25/3 gallons of gasoline.
Gasoline used/full tank = (25/3)/12 = 25/36

_________________
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

GMAT with Gurome

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