$[[$Use Matlab contourf function$]]$

Using the explicit finite difference method, find the temperature distribution at $t=0\mathrm{.}2$ of the following question:

$"$A $22m$ rectangular pipe initially at $300K$ is embedded the

center of a $66m$ rectangular material. Liquid nitrogen is suddenly

supplied at the inner pipe. Outer $4$ edges of the rectangular

material are kept constant at $300K,$ while inner $4$ edges $($e$.$g$.,$

outer edges of the liquid nitrogen pipe$)$ are kept constant at $77K."$

Submit the copy of your MATLAB code. Your one$-$page report should contain problem description, method for solving this problem, result and analysis.