Diffusion current practice problems

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A region of p-type semiconductor extends from x = 0 to x = L = 3.5 μm.

The hole concentration at x = 0 is 4.0e+10 cm^{-3}
and at x = L, it is 7.0e+10 cm^{-3}.

The hole diffusion coefficient in the region is 6 cm^{2}/s.

What is the hole current density in the region?