<PRE><B>Question 328411</B>
An airplane took 2.5 hours to fly 625 miles with the wind. It took 4 hours and 10 minutes to make the return trip against the same wind. Find the wind speed and the speed of the plane in still air.
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625 miles/2.5 hrs = 250 mph
625 miles/(4 1/6) hrs = 625/(25/6) = 150 mph
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The &quot;speed in still air&quot; is the airspeed, and is the average
= (250+150)/2 = 200 mph
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The windspeed is the difference: 250 - 200 = 50 mph

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