Question 5Four rods are connected together with flexible joints at their ends to make a quadrilateral as shown. Rods $PQ=40$ cm, $RS=20$ cm, $PS=60$ cm and $\angle QPS=\angle RSP=60^\circ$. Find $\angle QRS$. $100^\circ$$105^\circ$$120^\circ$$135^\circ$$150^\circ$
