Rosa is building a guitar. The second fret is 33.641\,\text{mm}33.641mm33, point, 641, start text, m, m, end text from the first fret. The third fret is 31.749\,\text{mm}31.749mm31, point, 749, start text, m, m, end text from the second fret.
How far is the third fret from the first fret?