It could be (2-ft x 20-ft).
Or it could be
1 x 21
3 x 19
4 x 18
5 x 17
6 x 16
7 x 15
8 x 14
9 x 13
10 x 12
11 x 11
or any one of an infinite number of other sets of dimensions,
as long as the length and width add up to 22.
You can't tell the length and width from the perimeter.
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You are describing a cuboid, not a rectangle. A rectangle has only two diminutions, length and width.
5 feet
If the dimensions of the rectangle are in feet, the perimeter will be in feet as well. The area will be in square feet. The area is length x width. The perimeter is 2 x (length + width) or 2 x length + 2 x width.
20
It is 17 feet