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Math Help - Direct & Inverse Variation

  1. #1
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    Question Direct & Inverse Variation

    How do I do the following problem using direct/indirect variation method?

    A train 210m long took 12 seconds to pass a 90m long tunnel. Find the speed of the train.

    Using speed, distance & time formula, this can be easily done using the formula

    Speed = Distance/Time
    Speed = (210 + 90)/12
    Speed = 300/12
    Speed = 25 m/sec (or 90 km/hr)

    But how do I do this problem using direct/indirect variation?

    Thanks,

    Ron
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  2. #2
    MHF Contributor

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    I don't know what you mean. "direct" and "indirect" variation are types of "proportions". There is no proportion here.
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