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Let the speed of the airplane in still air be represented by V.

Velocity = Distance ÷ Time, thus Distance = Velocity x Time.

D = 4(V + 20) = 5(V - 20), then 4V + 80 = 5V - 100 : V = 180 kph

The speed in still air is 180kph

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Q: An airplane flew for 4 hours with a 20 km hr tailwind The return flight against the same wind took 5 hours Find the speed of the airplane in still air?
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An airplane flew for 6 hours against a tail wind of 25 kmhr The return trip with the same wind took 5 hours Find the speed of the airplane in still air?

275 km/hr


An airplane flew for 6 hours against a tail wind of 25 kmhr. The return trip with the same wind took 5 hours. Find the speed of the airplane in still air?

275 km/hr


N airplane flew for 6 hours against a tail wind of 25 kmhr The return trip with the same wind took 5 hours Find the speed of the airplane in still air?

Very interesting. This was obviously a Wonderland Airlines flight, on a route where a tailwindslowed them down and a headwind sped them up.But we understand what you're trying to say.6 (S - 25) = 5 (S + 25)Eliminate parentheses:6S - 150 = 5S + 125Add 150 to each side:6S = 5S + 275Subtract 5S from each side:S = 275When the wind helps, ground speed is 300, the craft covers 1,500 in 5 hours.When the wind hurts, ground speed is 250, the craft covers 1,500 in 6 hours.


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An airplane flew for 4.23 hours with a 25.5-kmhr tail wind. The return flight against the same wind took 4.97 hours. Find the speed of the plane in still air?

Let the land distance travelled be d km Let the speed of the plane in still air be s km/h time = distance / speed On the first flight: 4.32 hr = d km / (s + 25.5) km/h → d km = 4.32 × (s + 25.5) km On the second flight: 4.97 hr = d km / (s - 25.5) km/h → d km = 4.97 × (s - 25.5) km → 4.32 × (s + 25.5) = 4.97 × (s - 25.5) → 4.32s + 25.5 × 4.32 = 4.97s - 25.5 × 4.97 → 4.97s - 4.32s = 4.97 × 25.5 + 4.32 × 25.5 → (4.97 - 4.32)s = 25.5 × (4.97 + 4.32) × 25.5 → s = 25.5 × (4.97 + 4.32)/(4.97 - 4.32) ≈ 364.45 km/h

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An airplane flew for 4.23 hours with a 25.5kmhr tail wind The return flight against the same wind took 4.97 hours Find the speed of the plane in still air?

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