Height And Distance

From the top \(\mathrm{A}\) of a vertical wall \(\mathrm{AB}\) of height \(30 \mathrm{~m}\), the angles of depression of the top \(\mathrm{P}\) and bottom \(\mathrm{Q}\) of a vertical tower \(\mathrm{PQ}\) are \(15^{\circ}\) and \(60^{\circ}\) respectively, \(\mathrm{B}\) and \(\mathrm{Q}\) are on the same horizontal level. If \(\mathrm{C}\) is a point on \(\mathrm{AB}\) such that \(\mathrm{CB}=\mathrm{PQ}\), then the area (in \(\mathrm{m}^{2}\) ) of the quadrilateral \(\mathrm{BCPQ}\) is equal to :