Incorrect. If Ada can wash half the fence in 2 hours, then she can wash the entire fence in 4 hours. How long would it take Celia to wash the entire fence? Use that information to write an expression relating the girls' rates, and set it equal to $\displaystyle\frac{{1}}{{t}}\usepackage{cmbright}\Huge\$ , the total amount of time needed for both of them to wash the entire fence.