An aeroplane leaves an airport and flies...

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(1)/(2)` hours?

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The correct Answer is:

`300 sqrt(61)km`

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