Australian AMC 2015 - Senior Question 23

Question 23

Points $P$, $Q$, $R$ and $S$ lie on a circle and $\angle SRQ=60^\circ$. If $RS=4$, $RQ=6$, $SP=x$ and $PQ=y$, then a possible solution for $x$ and $y$ is

Question illustration

$x=4$ and $y=2$
$x=y=3$
$x=y=4$
$x=4$ and $y=3$
$x=5$ and $y=2$