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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

Mar 3rd, 2015

It flies away for 425/212 hours and files back for another 425/305 hours. During that time it covers 425*2km. So the average speed is overall distance divided by the overall time and equals to 425*2/(425/212+425/305)=2/(1/212+1/305)=2*212*305/(305+212)=129320/517=250+70/517 which is around 250.1 km/h 

Mar 9th, 2015

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Mar 3rd, 2015
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