A pole on a cliff observed from a boat

A vertical pole \(PQ\) stands on a cliff whose top is \(Q\). A boat \(B\) is 90 m horizontally from the cliff foot. The angles of elevation of \(Q\) and \(P\) are \(55^\circ\) and \(62^\circ\), respectively. Find

1. 1. the cliff height,
   2. the pole height
2. the angle of depression of a boat 105 m from the cliff foot, viewed from \(Q\). Give non-exact lengths, areas and other numerical values to 3 significant figures, and angles to 1 decimal place, unless otherwise stated.