Australian AMC 2008 - Senior Question 20

Question 20

In the diagram, $RU$ is equal in length to $ST$. What is the ratio of the area of $\triangle QRU$ to the area of $\triangle QST$?

Question illustration

$\sqrt3:1$
2 : 1
$\sqrt6:1$
$\sqrt3:2$
$\sqrt6:2$