SOLUTION: Flying to Moscow with a tailwind a plane averaged 142 km/h. On the return trip the plane only averaged 76 km/h while flying back into the same wind. Find the speed of the plane in

Question 574369: Flying to Moscow with a tailwind a plane averaged 142 km/h. On the return trip the plane only averaged 76 km/h while flying back into the same wind. Find the speed of the plane in still air and the speed of the wind.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Flying to Moscow with a tailwind a plane averaged 142 km/h. On the return trip the plane only averaged 76 km/h while flying back into the same wind. Find the speed of the plane in still air and the speed of the wind.
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The plane's airspeed is the average = (142 + 76)/2 = 109 km/hr
The windspeed is the difference = 142 - 109 = 33 km/hr
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That's a slow plane, cars would pass it on the road going upwind or downwind.
142 km/hr =~ 85 mi/hr
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Also, planes don't use km/hr, they use knots.

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