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5 October, 23:43

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?

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  1. 6 October, 00:04
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    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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