Incorrect. Set up an equation that relates Stuart's rate of work (1 room in 4 hours), Tamara's rate of work (1 room in h hours), and the pair's rate of work (1 room in 2 hours): $\displaystyle\frac{{1}}{{4}}+\frac{{1}}{{h}}=\frac{{1}}{{2}}\usepackage{cmbright}\Huge\$ . Now solve for h.