Jet Plane

A jet plane makes a round trip from Yarmouth to Sydney. When the plane is flying into a headwind during the trip, its speed is 300 km/h, and its speed with a tail wind is 600 km/h. What is the average speed for the round trip?
Source: NCTM Mathematics Teacher, December 2005

Let d represent the distance in kilometers from Yarmouth to Sydney. If we assume that the trip to Sydney is made up entirely of head wind and that the return trip is made up entirely of tail wind, then the roundtrip flying time equals
The round trip average speed equals

Answer: 400 km/h


About mvtrinh

Retired high school math teacher.
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