please give solution for this?

The air pressure in a tyre reduces from 2 bars to 1.99 bars in five days. The volume of air in the tube= 0.025 m3 , the surface area 0.5 m2 and wall thickness 0.01 meter. The solubility of air in rubber is 0.07 m3 /m3 rubber. Estimate the diffusivity of air in rubber

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