A chemical plant produces a certain chemical through a reaction A B. The reaction rate is given by the equation: r = kCA, where r is the rate of reaction, k is the rate constant, and CA is the concentration of reactant A. The reaction is carried out in a batch reactor with a volume of 100 liters. Initially, the reactor is charged with 10 moles of A with a concentration of 0.1 M. The rate constant is 0.2 L/mol.min. Calculate the time required for the reaction to reach 90% conversion.