Posted by **Piper** on Monday, June 16, 2014 at 10:27pm.

An airplane takes off at 9:00 A.M. and flies at 300. km/h until 1:00 P.M. At 1:00 P.M. its speed is increased to 400. km/h, and it maintains this speed until it lands at 3:30 P.M. What is the airplaneās average speed for the entire flight?

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