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From the top of a building of height 20m, the angles of depression of the top and bottom of a tower are $$30^\circ, 60^\circ$$ respectively. Then the height of the tower. in meters, is
$$15\frac{1}{3}$$
$$13\frac{1}{3}$$
$$11\frac{1}{3}$$
$$9\frac{1}{3}$$
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