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An aeroplane leaves an airport and flies...

An aeroplane leaves an airport and flies due west at a speed of 2100 km/hr. At the same time, another aeroplane leaves the same place at airport and flies due south at a speed of 2000 km/hr. How far apart will be the two planes after 1 hour?

A

Basic Proportionality

B

Converse of Thales theorem

C

Pythagoras theorem

D

Similarity of triangles

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