The shadow of a tower standing on level ground is found to be 40 m longer when the Sun's altitude is 30° than when it was 45°. Find the height (in meters) of the tower.
1
10(\(\sqrt3\) - 1)
2
20(\(\sqrt3\) - 1)
3
20(\(\sqrt3\) + 1)
4
10(\(\sqrt3\) + 1)