Heena observed from the top of the tower which is 80 m above the surface of river. The angle of elevation of the balloon in the sky measures 30 degree and the angle of depression of shadow of the balloon in the river is 60 degree. The height of the balloon above the surface of the river is?

Heena observed from the top of the tower which is 80 m above the surface of river. The angle of elevation of the balloon in the sky measures 30 degree and the angle of depression of shadow of the balloon in the river is 60 degree. The height of the balloon above the surface of the river is?
1). 40
2). 80
3). 160
4). 320

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