A aeroplane is flying horizontally with speed of 432 km/hr at height h meter from ground. Its angle of elevation from a point on ground is 60°. After 20 sec its angle of elevation from same point is 30° then the height 'h' is equal to

\(A) 1200\sqrt3\)

\(B) 600\sqrt3\)

\(C) 1800\sqrt3\)

\(D) 1000\sqrt3\)