I have this task that I had to solve. I am going to translate it as good as I can from the original language:

The diffusion coefficient of Piroxicam in aqueous solution is 5,45*10^{-10} m^{2}s^{-1} at 25 C. The Viscosity of water at 25 C and 37 C is respectively 8,91*10^{-4} Pa s and 6,92*10^{-4} Pa s

I used the following formulas in order to find the diffusion coefficient:

R=kT/6πηD and got **4,42*10**^{-10} m

Then

D=kT/6πηR and got **7,42*10**^{-10} m^{2} s^{-1}

However, once checking for my answer I saw that the last answer was correct but they also included this answer: 4,45*10^{-4} cm^{2} min^{-1}

How did they achieve this answer? I hope someone can help me.

Thanks in advance!