From the top of a platform, the angle of elevation of a tower was $$30^\circ$$. The tower was 45 m high and the horizontal distance between the platform and the tower was $$40\sqrt{3}$$ m. What was the height of the platform?

A

40 m

B

5 m

C

$$45\sqrt{3}$$ m

D

$$20\sqrt{3}$$ m