Row Reduction & Rank · Easy problem

Gaussian elimination is applied to $\begin{pmatrix} 1 & 1 & 1 \\ 1 & 2 & 3 \\ 1 & 3 & 5 \end{pmatrix}$. First, row 1 is subtracted from rows 2 and 3. In the next step, what multiple of the new row 2 is subtracted from the new row 3 to create a zero below the second pivot?