In the figure, lines $k$ and $l$ are parallel, and they are intersected by transversal $t$. Angle $P$ and angle $Q$ are corresponding angles. Angle $Q$ and angle $R$ are alternate interior angles. Angle $R$ and angle $S$ form a linear pair. If $P=2y+20$ and $S=3y-10$, what is the measure of angle $Q$?