The angle of elevation of the top of a tower from the top of a building whose height is 680 m is 45° and the angle of elevation of the top of same tower from the foot of the same building is 60°. What is the height (in m) of the tower?
1
340(3 + √3)
2
310(3 - √3)
3
310(3 + √3)
4
340(3 - √3)