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

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Question 312375: An airplane flies 80 km in 10 minutes and the flies 100 km in 20 minutes. The average speed of the airplane is?
Answer by Fombitz(13828) About Me  (Show Source):
You can put this solution on YOUR website!
It flew a total of 180 km in 30 minutes(or 1/2 hr).
Vave=180%2F%281%2F2%29=360kph