Question 1140414
R=k/d^2 is the formula where resistance R is proportional to (constant of proportionality is k) square of diameter d.  Assume length will be the same with both.

0.4=k/3^2
0.4=k/9
k=3.6

use that in the next part.
R=3.6/2^2=3.6/4 =0.9 ohms