To find the answer to this question you will subtract the 2 1/4 inches from the original 19 1/8 inch piece.
19 1/8 - 2 1/4
19 1/8 - 2 2/8
18 9/8 - 2 2/8
16 7/8 inches
This leaves you with 16 7/8 inches to divide 5 ways.
16 7/8 divided by 5
3 3/8 inches per piece