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A reconnaissance plane flies 425 km away from its base at 212 km/h, then flies back to its base at 305 km/h. What is its average speed?


______ km/h

Oct 22nd, 2017

A reconnaissance plane flies 425 km away from its base at 212 km/h, then flies back to its base at 305 km/h. What is its average speed?

The average speed is the harmonic mean of the tow speeds

V = 2*212*305/(212+305) =  250.13 km/h


Mar 3rd, 2015

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