# SOLUTION: Elizabeth drove the first half of a trip at 36 mi/h. At what speed should she cover the remaining half in order to average 45 mi/h for the whole trip?

Algebra ->  Algebra  -> Percentage-and-ratio-word-problems -> SOLUTION: Elizabeth drove the first half of a trip at 36 mi/h. At what speed should she cover the remaining half in order to average 45 mi/h for the whole trip?      Log On

 Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help! Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

 Word Problems: Problems on percentages, ratios, and fractions Solvers Lessons Answers archive Quiz In Depth

 Question 72140This question is from textbook Algebra and Trigonometry: Structure and Method : Elizabeth drove the first half of a trip at 36 mi/h. At what speed should she cover the remaining half in order to average 45 mi/h for the whole trip?This question is from textbook Algebra and Trigonometry: Structure and Method Answer by checkley75(3666)   (Show Source): You can put this solution on YOUR website!36/2+X/2=45 36/2+X/2=45 (36+X)/2=45 90=36+X X=90-36 X=54 MPH FOR THE LAST HALF OF THE TRIP. PROOF 36/2+54/2=45 18+27=45 45=45