Answer: 5 feet.
Explanation:
The area of a rectangle can be calculated with the following formula:

Where "l" is the length and "w" is the width.
In this case you know that the area of the kitchen is 6 times as many square feet as Jason’s pantry, then, the length of the pantry can be represented as:

Since:

You can substitute the known values into the formula and solve for "l" in order to calculate its value.
You get that this is:
