please it's a petrophysics question not fluid mechanics.

a) calculate the permeability of the channel in Darcy b) find the average permeability of the rock sample if the flow is linear and in the direction of the channel in millidarcy

please read carefully because the existing solutions are for different question and not this

Questions 8. The rock sample shown below has a channel that partially traverses the length of the sample. The rock sample had a permeability of 15 mD before the channel was drilled into it