The shadow of a tower is found to be x m...

The shadow of a tower is found to be x metre longer, when the angle of elevation of the sun changes from `60^(@)` to `45^(@)`. If the height of the tower is `5(3+sqrt(3))`m, then what is x equal to ?

A

8 m

B

10 m

C

12 m

D

15 m

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