Q 3071756626.     An aeroplane leaves an airport and flies due north, at a speed of `1000km` per hour. At the same time, another aeroplane leaves the same airport and flies due west at a speed of `1200km` per hour. How far apart will be the two planes after `1\frac{1}{2}` hours?

A

`300\sqrt {5}m`

B

`300 m`

C

`300\sqrt {61}m`

D

`3000m`

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