SOLUTION: Terri drove for 3 hours before lunch. After lunch she drove 4 more hours and averaged 15mph more than before lunch. If her total distance was 410 miles, what was her average speed

Question 1196547: Terri drove for 3 hours before lunch. After lunch she drove 4 more hours and averaged 15mph more than before lunch. If her total distance was 410 miles, what was her average speed before lunch?
Answer by ikleyn(52776) (Show Source): You can put this solution on YOUR website!
.


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.


ANSWER.  Terri's average rate before lunch was 50 miles per hour.

Solved.

RELATED QUESTIONS
Jerry drove for 4 hours before lunch. After lunch he drove 5 more hours and averaged 10... (answered by josmiceli)

Mr. Blackstone drove from his city hoe to his country house, stopping for lunch on the... (answered by ikleyn)

Before lunch, Sally drove from Idabel to Ardmore, averaging 50 mph. After lunch she... (answered by josmiceli)

a) The perimeter of a rectangular field is 120 meters. Its length is 10 meters more than... (answered by rothauserc)

Cross-country cycling. Erin was traveling across the desert on her bicycle. Before lunch (answered by jim_thompson5910)

Before lunch, Brendan drove 110 miles in 2 hours. After lunch he drove 210 miles in 3.5... (answered by Alan3354)

One morning, Justin drove 5 hours before stopping for lunch at a pizza place. After... (answered by Boreal)

One morning Madeline drove 5 hours before stopping to eat. After lunch, she increased her (answered by stanbon,josmiceli)

A painter has learned that the time it takes her to paint a random room in a house is... (answered by stanbon)