Question 1201221
.


In this site, there is a lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/misc/Solving-minimax-problems-by--the-Linear-Programming-method.lesson>Solving minimax problems by the Linear Programming method</A> 

which teaches and explains on how to solve linear programming problems on the introductory level.


Read it and learn the subject from scratch.



This reading will be definitely enough to you to solve your problem (a) on your own.