Related Rates

A triangle has altitude increasing at $3 \ \textrm{cm}/\textrm{min}$ while its area is increasing at $4\ \textrm{cm}^2/\textrm{min}$. At what rate (in $\ \textrm{cm}/\textrm{min}$) is the base of the triangle changing when the altitude is $2 \ \textrm{cm}$ and the area is $6 \ \textrm{cm}^2$?