Ratio and Proportion

Three containers have their volumes in the ratio 3:4:5. They are full of mixtures of milk and water. The mixtures contain milk and water in the ratio of $\left(4:1\right),\left(3:1\right)$ and $\left(5:2\right)$ respectively. The contents of all these three containers are poured into a fourth container.
The ratio of milk and water in the fourth container is