UPSC NDA 2 2022 Mathematics Solved Paper

Consider the following for the next three (03) items that follow :There are two points $P$ and $Q$ due south of a leaning tower, which leans towards north. $P$ is at a distance $x$ and $Q$ is at a distance $y$ from the foot of the tower $(x>y)$. The angles of elevation of the top of the tower from $P$ and $Q$ are $15^{\circ}$ and $75^{\circ}$ respectively.