Negative to paper: 73,7cm (28 7/8 in).
Negative to lens nodal point: 31,3cm (12 1/4 in)
Lens to paper: 42,4cm (16 5/8 in)

Assuming nothing (including the lens) has any optical thickness, which isn't true - and there are rounding off errors as well. But it's in the right range.