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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 1:11 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

    Thanks in advanced

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    killer1387 GMAT Destroyer! Default Avatar
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    Post 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

    Thanks in advanced
    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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    Anurag@Gurome GMAT Instructor
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    Post 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

    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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