Kite inclination and cliff distance

Core stretch

From the top of a building, the angle of elevation of the top of a 420 m cliff is \(48^\circ\), while the angle of depression of its foot is \(18^\circ\). Find the horizontal distance between the building and cliff. Give non-exact lengths, areas and other numerical values to 3 significant figures, and angles to 1 decimal place, unless otherwise stated.[3]