Problem SE2

Consider again the GMO of the previous exercise and assume that, owing to a fault in genetically engineering the insect, a few individuals are not sterile; so they can not only disperse but also grow in numbers with a Malthusian instantaneous growth rate $r = 0.5$    year$^{-1}$. Estimate the expansion speed (m year$^{-1}$) of the GMO into the surrounding environment.