The angle of elevation of the top of a tower from the top of a building whose height is 680 m is $$45^{\circ}$$ and the angle of elevation of the top of same tower from the foot of the same building is $$60^{\circ}$$. What is the height (in m) of the tower?

A

$$340(3 + \sqrt{3})$$

B

$$310(3 - \sqrt{3})$$

C

$$310(3 + \sqrt{3})$$

D

$$340(3 - \sqrt{3})$$