SOLUTION: During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?

Algebra ->  Algebra  -> Customizable Word Problem Solvers  -> Misc -> SOLUTION: During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com
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!

   

Question 51443: During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
let x be the time
EQUATION:
40(4)+60x=55(x+4)
160+60x=55x+220
5x=60
x=12
HEnce, you must travel for 12 hours.
Paul.