The reaction $\mathrm{X}\mathrm{ }+\mathrm{ }\mathrm{Y}\to \mathrm{Z}$ is first order with respect to $\text{X}$ and second order with respect to $\text{Y}$, initial rate of formation of $\text{Z}\text{=}\text{R}\text{mol}{\text{dm}}^{\text{3}}{\text{sec}}^{-\text{1}}$ when $\text{[X]}$ and $\text{[Y]}$ are $\text{0}\text{.40}\text{mol}{\text{dm}}^{-\text{3}}$ and $\text{0}\text{.30}\text{mol}{\text{dm}}^{-\text{3}}$ respectively. If $\text{[X]}$ is halved and $\text{[Y]}$ is doubled, the value of the initial rate would become