I have a text file with data and i would like to know how to attack this specific question. If anyone has a suggestion, please let me know. Thanks.

Given a substance with Diffusion coefficient of 1.1x10-5 cm2/s diffusing into a semi-infinite slab, calculate the time it takes for the concentration 2.0 cm deep into the slab to be 1/3 what it is at the slab's interface.

how is it a matlab question?

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