29-11-2017
Mathematics

contestada

A plane traveling from phoenix to san Francisco with a tailwind of 35 miles per hour takes 2.5 hours. returning with the headwind it takes the same plane 2 hours and 45 minutes.
what is the average speed of the plane in calm conditions?

Respuesta :

29-11-2017

Let p=plane speed
2.5(p+35)=2.75(p-35), 2.5p+87.5=2.75p-96.25.
183.75=0.25p, so p=735mph.

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