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.
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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.
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