A new drug is in development and an appropriate particle size must be found for the appropriate dissolution rate (e.g.complete dissolution of the drug in 30 min). This drug has a continuous water solubility of 10μg/mL in a range of pH 1-7. The density of the crystalline form of the drug is given p=52 g/cm³. The diffusion coefficient D=9/10^-6 cm²/sec. Calculate the dissolution times of particles with a diameter of 1μm, 10 μm και 100 μm.