Second part asks: What is the tension in the cord connecting blocks A and B just before they start to slide?

Required information The coefficient of static friction between block A and a horizontal floor is 0.340, and the coefficient of static friction between block B and the floor is 0.300. The mass of each block is 2.00 kg, and they are connected together by a cord. If a horizontal force F pulling on block B is slowly increased, in a direction parallel to the connecting cord, until the blocks start sliding, what is the magnitude of F at the instant that they start to slide