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∘ and 75∘ respectively.