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Math Help - Mileage

  1. #1
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    Mileage

    If you drive 832 miles in a period of 21 hrs, and if you use a total of 29 gallons of gasoline on the trip,

    a.) Determine the avg. speed in mi/h

    I said 832/21 = x/1 => x = 39.6 mi/h

    b.) Determine the avg. speed in km/h

    I said 1km = 0.625 mi and so 39.6/x = .625mi => x = 63.4 km/h

    c.) Determine gas mileage you used in km/L

    I said 29/21 = x/1 => x = 1.38 gallons (but this gives you 1 gallon per 1 km)..
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  2. #2
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    Can someone confirm if a and b are correct? Looking back at it, I am thinking not because that doesn't give me the average. Should I first do 832/31 to get the avg miles per hour, then convert this to kilometers? I think what I did was make it more harder.

    And then for c not sure.
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  3. #3
    Moo
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    Hello,
    Quote Originally Posted by DiscreteW View Post
    Can someone confirm if a and b are correct? Looking back at it, I am thinking not because that doesn't give me the average. Should I first do 832/31 to get the avg miles per hour, then convert this to kilometers? I think what I did was make it more harder.

    And then for c not sure.
    No it's ok for a and b. If you calculated b with the exact value of a and not 39.6 (i'm talking in general, not for this exercise in particular)

    for c. :
    first convert 29 gallons into L (1 gallon = 3,78541178 litres). This gives result m.
    and convert 832 mi into km. This gives result n.

    Then :
    n km --> m L

    ---> x=n/m
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  4. #4
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    Miles per Gallon

    If I'm getting an average of 600km per 90L tank in my truck, how many miles per gallon am I getting?
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  5. #5
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    Quote Originally Posted by Tokes View Post
    If I'm getting an average of 600km per 90L tank in my truck, how many miles per gallon am I getting?
    convert km to miles and liters to gallons.

    btw, start a new problem with a new thread.
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