If it takes 2 seconds to solve a two dimensional, diffusion equation 2 T 0 with 20 nodes in x and y using banded Gauss elimination, how long does it take for 40 nodes in x and y

Question: If it takes 2 seconds to solve a two-dimensional, diffusion equation 2 T = 0 with 20 nodes in x and y using banded

If it takes 2 seconds to solve a two-dimensional, diffusion equation ∇²T = 0 with 20 nodes in x and y using banded Gauss elimination, how long does it take for 40 nodes in x and y?

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