how do I determine 5/6 from this data:

data-

5. (1 pt) When was the yellow color first visible? Compare the cuvetre to your blank. 6. (1 pt) Approximately how long did the mixture continue to become more yellow? \begin{tabular}{|r|r|r|r|} \hline \multicolumn{1}{|c|}{ A } & \multicolumn{1}{c|}{ B } & \multicolumn{1}{c|}{ C } \\ \hline Time (Min.) & Absorbance (OD) 1 & Absorbance (OD) 2 & Average Absorbance (OD) R \\ \hline 0 & 0.899 & 0.153 & 0.526 \\ \hline 1 & 1.481 & 0.885 & 1.183 \\ \hline 2 & 2.009 & 1.575 & 1.792 \\ \hline 3 & 2.394 & 2.157 & 2.2755 \\ \hline 4 & 2.6 & 2.516 & 2.558 \\ \hline 5 & 2.691 & 2.67 & 2.6805 \\ \hline 6 & 2.723 & 2.718 & 2.7205 \\ \hline 7 & 2.732 & 2.729 & 2.7305 \\ \hline 8 & 2.734 & 2.73 & 2.732 \\ \hline 9 & 2.734 & 2.73 & 2.732 \\ \hline 10 & 2.734 & 2.731 & 2.7325 \\ \hline \end{tabular}