Question 1196547
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Write the total distance equation

    3B + 4*(B+15) = 410  miles  total.

where B is her average rate before lunch, in miles per hour.


Simplify the equation and find B

    3B + 4B + 60 = 410

      7B         = 410 - 60

      7B         =   350

       B         =   350/7 = 50.


<U>ANSWER</U>.  Terri's average rate before lunch was 50 miles per hour.
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Solved.