# SOLUTION: An airplane flew for 4 hours with a 20 km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air.

Algebra ->  Algebra  -> Systems-of-equations -> SOLUTION: An airplane flew for 4 hours with a 20 km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air.      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!

 Algebra: Systems of equations that are not linear Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Systems-of-equations Question 32610: An airplane flew for 4 hours with a 20 km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air.Answer by Paul(988)   (Show Source): You can put this solution on YOUR website!lET THE SPEED OF THE PLANE BE X Equation: 4(x+20)=5(x-20) 4x+80=5x-100 -x=-180 x=180 Hence, the speed of the plane is 180mph. Paul.