An aeroplane flying at a height of 300 m above the ground passes vertically above another pane at an...........

Quantitative Aptitude (CDS) Trignometry

An aeroplane flying at a height of 300 m above the ground passes vertically above another pane at an instant when the angles of elevation of the two planes from the same point on the ground are 60^o and 45^o respectively. What is the height of the lower plane from the ground?

$100\sqrt{3}\;m$