Physics

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 airplane’s average speed for the entire flight?

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1. 4 hr * 300km/hr = 1200km
2.5 hr * 400km/hr = 1000km

2200km/6.5hr = 338.46km/hr

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posted by Steve

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