A solution of glucose at a concentration of 0.5 mol/L is separated from a solution of fructose at a concentration of 0.3 mol/L by a semi-permeable membrane. The membrane has a thickness of 0.2 cm and a surface area of 10 cm^2. The diffusion coefficient of glucose and fructose are 1.0 x 10^-9 m^2/s and 1.5 x 10^-9 m^2/s, respectively. Calculate the rate of diffusion of glucose and fructose through the membrane.