Mathematics, 19.09.2019 05:50, brandy2115

An airplane travels 2100 km at a speed of 500 km/hr encounters a head wind that decreases its speed to 400km/h for the next three hours and then travels the last 400km to complete the trip at an average speed for the entire trip of 440 km/h what was the speed of the plane for the last part of the trip

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An airplane travels 2100 km at a speed of 500 km/hr encounters a head wind that decreases its speed...