An aeroplane leaves an airport and flies due north at a speed of 1000 km per hour. At the same time, another aeroplane

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Q 3011580429.     An aeroplane leaves an airport and flies due north at a speed of 1000 km per hour. At the same time, another aeroplane leaves the same airport and flies due west at a speed of 1200 km per hour. How far apart will be the two planes after 1\frac{1}{2} hours?

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