Two substances A and B are combined to form a product C. The formation of the product is proportional to the time the reactants are combined. The final product is composed of three parts of A for every part of B. If initially A is 50 lbs and B is 60 lbs, and 10 lbs of the product are formed after 45 mins., find the time it takes for the reaction to form 25 lbs. What is the answer? Show the solution. A. 153 mins B. 135 mins

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