78" x 80" x 9" is the total size A king box spring comes in two pieces each one 39" (wide) and 80" (Tall) So to answer the question: A king box spring is Two separate pieces, each piece is: 39" x 80"...
They will not. A queen size bed is 60" x 80" and a twin size is 39" x 75" and an XL twin would be 39" x 80". Two XL twin box springs are what you would use for a king size bed.
Your question is missing one key element: a queen what? If you are trying to place a queen mattress on a twin-sized box spring, the answer is a definite no. If you'd like to use a queen sized...