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Math Help - metric conversion

  1. #1
    Junior Member
    Joined
    Dec 2006
    Posts
    60

    metric conversion

    Convert the following values to metric. Show all steps + cancellations:

    0-60 mph in 10.5 s
    113 mph (miles per hour)
    14 mpg (miles per gallon)

    thanks.
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  2. #2
    Newbie
    Joined
    Feb 2008
    Posts
    8
    There is about 1.6km in 1 mile, so -

    (1) 0 - 60 mph in 10.5s becomes 0 - (60X1.6)km/h in 10.5s which is:

    0 - 96km/h in 10.5s

    (2) 113mph = 113 X 1.6 km/h = 181km/h

    There are 4.54 litres/gallon, so -

    (3) 14mpg = 14 x 1.6 km/gallon = (14 x 1.6)/4.54 km per litre = 4.9 km/litre

    However, fuel efficiency in metric is generally looked at in the opposite way:

    4.9 km/l = (1/4.9) litres/km or in a more useful (100/4.9) litres per 100km = 20.4 l/100km

    Edit: I just realised that the US gallon is a different size to the British gallon, so you may need to change the conversion factor above (4.54l/g to the correct US one which I don't know of the top of my head (3.?? l/g I think).
    Last edited by careri; February 4th 2008 at 06:12 PM. Reason: US gallon clarification
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