ANSWER:
[tex]16\frac{1}{3}=5\frac{1}{4}+5\frac{2}{3}+x[/tex]STEP-BY-STEP EXPLANATION:
We have that there is a total time and a time for each week, the time for each week is equal to the total time, therefore the equation is the following
[tex]16\frac{1}{3}=5\frac{1}{4}+5\frac{2}{3}+x[/tex]Therefore the correct equation is option A.
Now to calculate the value of x we must solve for x like this:
[tex]\begin{gathered} x=16\frac{1}{3}-5\frac{1}{4}-5\frac{2}{3} \\ x=5\frac{5}{12} \end{gathered}[/tex]Therefore the time of week 3 is 5 5/12 hours