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Math

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Harry drove for 6 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 5 more hours on a country road. If his total trip was 648 miles, then what was his speed on the freeway?

  • Math - ,

    His initial speed was 68mph. Using Distance = Rate * Time, we get:
    Let r = speed for 6 hours,
    r-20 = speed for 5 hours, so:
    648 = 6r + 5*(r - 20).
    Hope this wasn't in Wi because the max legal speed limit is 65mph!

  • Math - ,

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