What is the answer to number 6? (photo)

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

What is the volume of this container?

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges