The elevation in boiling point for 1 molal solution of non-volatile solute A is 3 K. The depression in freezing point for 2 molal solution of A in…

The elevation in boiling point for $\displaystyle 1$ molal solution of non-volatile solute A is $\displaystyle 3$ K . The depression in freezing point for $\displaystyle 2$ molal solution of A in the same solvent is $\displaystyle 6$ $\displaystyle K$. The ratio of $\displaystyle K_b$ and $\displaystyle K_f$ i.e., $\displaystyle K_b / K_f$ is $\displaystyle 1$: $\displaystyle X$. The value of $\displaystyle X$ is [nearest integer]