Speed translation
Learn more: http://www.khanacademy.org/video?v=aTjNDKlz8G4Translating speed units
Length:
09:55
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You first need to multiply 400 by 60 and then multiply the result by 60 again. This will give you the value of feet per hour since there are 60 seconds in a minute and 60 minutes in an hour ...