5. (A) A rectangular fenced area split into two pens is to be constructed out of 80m of fence as shown in the diagram. The minimum that the width can be is 10m and the minimum that the length can be is 6m. Determine the dimensions of the fenced area that will maximize the total enclosed area. Be sure to provide a full solution including let statements, diagrams, restrictions, conclusion, etc. (4 marks) Width Length