Write two applications of freezing mixture

A thermally insulated cubical box of side length $20 \mathrm{cm}$ and wall thickness $2 \mathrm{cm}$ containing $2 \mathrm{kg}$ of ice is closed on all sides. The mass of ice melted in $10$ hours is (Thermal conductivity of the material of the box $=0.01 {\mathrm{Wm}}^{-1} {\mathrm{K}}^{-1},$ latent heat of ice $=360\times {10}^3 \mathrm{J} {\mathrm{kg}}^{-1}$ and ambient temperature $=40 °\mathrm{C}$)

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$