Find the distance between the skew lines $P(t) = \left(-3,1,-3\right) + t \left<-3,2,-1\right>$ and $Q(t) = \left(3,5,0\right) + t \left<1,-1,2\right>$. Hint: Take the cross product of the slope vectors of $P$ and $Q$ to find a vector normal to both of these lines.

distance = .