The answer is 8\(\frac{1}{24}\)
Here's the math:
\(\frac{(26 + \frac{1}{3} ) - (10 + \frac{1}{4} )}{2}\)
\(\frac{(79/3 - 41/4)}{2}\) =
\(\frac{(79*4 - 3*41)}{(12*2)}\) =
\(\frac{(316 - 123)}{24}\) =
\(\frac{193}{24}\) =
8 \(\frac{1}{24}\) inches from the edge