A ballon is observed simultaneously from...

A ballon is observed simultaneously from the 3 points A,B,C on a staight road dirctly beneath it. The angles elevation at B is twice that at A and the angular elevation on at C is thrice that at A. If AB = 20, BC = 40 then the height of the ballon is

`3sqrt(15)`

`5sqrt(15)`

`8sqrt(15)`

`15sqrt(5)`

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