From the top of a tower , which is 240m...

From the top of a tower , which is 240m high , if the angle of depression of a point on the ground is `30^@`. then the distance of the point from the foot of the tower is

`240xxsqrt3m`

`40xxsqrt3m`

`80xxsqrt3m`

`120xxsqrt3m`

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