SOLUTION: A truck driver drove 357 miles in 7 hours, part of the time averaging 45 miles an hour and part of the time averaging 55 miles an hours. How many times did he drive at each rate?

Algebra ->  Square-cubic-other-roots -> SOLUTION: A truck driver drove 357 miles in 7 hours, part of the time averaging 45 miles an hour and part of the time averaging 55 miles an hours. How many times did he drive at each rate?      Log On


   

Question 1112030: A truck driver drove 357 miles in 7 hours, part of the time averaging 45 miles an hour and part of the time averaging 55 miles an hours. How many times did he drive at each rate?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
SPEED         TIME         DISTANCE

45            7-x           45(7-x)

55             x            55x

                7            357


45%287-x%29%2B55x=357