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An aeroplane leaves an airport and flie...

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

A

1700 km

B

1800 km

C

1900 km

D

2000 km

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