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GMAT PREP PS question

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alex.gellatly GMAT Destroyer! Default Avatar
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GMAT PREP PS question Post Mon Apr 16, 2012 1:14 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

    Thanks in advanced

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    niketdoshi123 Really wants to Beat The GMAT!
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    Post 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,
    the correct answer is E

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    Anurag@Gurome GMAT Instructor
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    Post 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

    Thanks in advanced
    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

    The correct answer is E.

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    alex.gellatly GMAT Destroyer! Default Avatar
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    Post 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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