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math

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harry drove for 4 hours on the freeway , he decreased his speed by 20 mph than drove for 5 hours on the country road. If his total trip was 449 miles, than what was his speed on the freeway

  • math -

    distance = speed * time, so if his freeway speed was s, then

    4s + 5(s-20) = 449

  • math -

    Freeway speed
    Country road speed
    4r + 5(r-20) =449

    4r +5r -100 =449
    9r = 549

    r = 61

    Freeway 61 mph

  • math -

    Harry drove for 3 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 6 more hours on a county road. If his total trip was 330 miles, than what was his speed on the freeway?

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