Finding the height of a rectangular prism

Question

You are making an open rectangular box out of a piece of cardboard. The box will be formed by making the cuts shown in the diagram and folding up the sides so that the flaps are square. The cardboard has a width of 6 inches by 12 inches.

1. What are the dimensions of the box?

2. What is the maximum volume?

This is the exact wording of the question.

1. There is no diagram.

2. I can't figure this out.

Answer 1

The max I get is 40.5sq/in.

4*10*1=40cu/in

3*9*1.5=40.5 "

2*8*2=32 "