7 Two lifeboat stations, \(P\) and \(Q\), are situated on the coastline with \(Q\) being due south of \(P\). A stationary ship is at sea, at a distance of 4.8 km from \(P\) and a distance of 2.2 km from \(Q\). The ship is on a bearing of \(155 ^ { \circ }\) from \(P\).
- Find any possible bearings of the ship from \(Q\).
- Find the shortest distance from the ship to the line \(P Q\).
- Give a reason why the actual distance from the ship to the coastline may be different to your answer to part (ii).