This question was well attempted by the candidates though many could not draw the diagram correctly.  The diagram actually reduced to a right   angled   triangle   with   |ZY|  as   hypothenus.  Hence   ZY   
=       √ 802  +  602   =   100 km.  The angle between  XY and ZY 
=   tan-1  (80/60)  =  53.12°.  Thus   the   bearing   of   Z  from  Y  is   given    by 315 – 53.12  =  261.88°.