college algebra

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driving along a crowded freeway you notice that it takes a time to go from one mile marker to the next. when you increase your speed by 8.4 mi/hr the time to go one mile decreased by 14 seconds. What was your original speed?

  • college algebra -

    if your sped is s, and keeping everything in hours:

    1/(s+8.4) = 1/s - 14/3600
    s = 42.465 mi/hr

  • college algebra -

    driving along a crowded freeway you notice that it takes a time to go from one mile marker to the next. when you increase your speed by 8.4 mi/hr the time to go one mile decreased by 14 seconds. What was your original speed?

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