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 ->
Customizable Word Problem Solvers
-> Travel
-> 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
Question 828808: 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 josgarithmetic(39617) (Show Source):
You can put this solution on YOUR website! ___________________speed_________time____________distance
WITHWIND___________r+20__________4_______________
AGAINSTWIND________r-20__________5_______________
Can you figure what to do with what?
What appears as two equations with two unknowns can be transformed into ONE equation with ONE unknown.
(