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## GMAT PREP PS question

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alex.gellatly GMAT Destroyer!
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GMAT PREP PS question Mon Apr 16, 2012 1:14 am
Elapsed Time: 00:00
• 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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niketdoshi123 Really wants to Beat The GMAT!
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Mon Apr 16, 2012 3:41 am
Total distance traveled = 5*50 = 250 miles
if the car uses 1 gallon of gasoline every 30 miles,
then total gallons of gasoline used is = 250/30 = 8.33
So,
Amount of gasoline used / Full tank gasoline = 8.33/12 =25/36

Hence,

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Anurag@Gurome GMAT Instructor
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Mon Apr 16, 2012 3:49 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

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1-800-566-4043 (USA)

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alex.gellatly GMAT Destroyer!
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Tue Apr 17, 2012 6:22 pm
Sorry for putting the same post twice everyone. My Internet had frozen. I'm not sure what happened.

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