If a car has 75 cubic feet of cargo space how wide is it?

Answer 1

You can't tell. There are an infinite number of boxes with different dimensions

that all have the same volume.

Here are a few examples of 75 cubic feet of volume:

1 x 1 x 75

1 x 3 x 25

5 x 5 x 3

1 x 15 x 5

5 x 2 x 7.5