I need a complete solution for this problem: A six passenger plane cruises...

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sierra

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...at 180 mph in? calm air. If the plane flies 7 miles with the wind in the same amount of time as it flies against the wind, then what is the wind speed?
calm air. If the plane flies 7 miles with the wind in the same amount of time as it flies 5 miles against the wind, then what is the wind speed?
 
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