SOLUTION: An airplane flies 80km in 10 minutes and then flies 100km in 20 minutes. The average speed of an airplane is?

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Question 255902: An airplane flies 80km in 10 minutes and then flies 100km in 20 minutes. The average speed of an airplane is?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
An airplane flies 80km in 10 minutes and then flies 100km in 20 minutes. The average speed of an airplane is?
:
He flew 180 km in 30 min (.5hr)
Av speed = 180/.5 = 360 km/hr