94. Solving a chemistry problem

10. A mixture of salicylic acid (I) and acetylsalicylic acid (II) was divided on plates "Silufol"; we obtain the following results. The distances from the start line to the center of the spots (I) and (II) are 20 mm and 45 mm, respectively; diameter of spots (I) and (II) - 2 mm and 3 mm. The distance from the start line to the finish line is 50 mm, Calculate the mobility coefficient of salicylic acid and the degree (criterion) of separation R (acetylsalicylic acid / salicylic acid), Answer; 0.40; ten.