<PRE><B>Question 956724</B>
Dave and Sandy Hartnarft are frequent flyers wit Delta Airlines. They often fly from Philadelphia to Chicago, a distance of 780 miles. On one particular trip, they fly into the wind, and th flight takes 1 and 1/2 hours. If the wind speed is the same on each trip, find the speed of thewind and dinf the speed of the plane in still air.
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With that info you can find the groundspeed.
780 mi/1.5 hr = 520 mi/hr
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The windspeed is added to or subtracted from the plane&#39;s airspeed to get the groundspeed.
Upwind:  GS = AS - W
Downwind:  GS = AS + W
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This is assuming a direct headwind or tailwind.
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