Two chemicals A and B are combined to form a chemical C. The rate of the reaction is proportional to the product of the instantaneous amounts of A and B not converted to chemical C. Initially there are 41 grams of A and 40 grams of B, and for each gram of B, 1.9 grams of A is used. It has been observed that 20.25 grams of C is formed in 10 minutes. How much is formed in 30 minutes? What is the limiting amount of C after a long time ?

grams of C are formed in 30 minutes:--------? grams is the limiting amount of C after a long time:--------?