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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 kphThe speed in still air is 180kph
275 km/hr
275 km/hr
15 miles
20 hours a month