Lisa is a manager at a maid service company. She has two maids working for her, Sophia and Cameron. Sophia can clean a small house in 7 hours while Cameron can clean the same small house in 10 hours.
Part A: How long will it take Sophia and Cameron to clean the small house together? A complete answer will include an equation representing the situation and all steps in solving the equation.
Part B: The manager Lisa thinks if they work together on the small house, they can clean it in 8.5 hours. Is Lisa correct or incorrect? Explain your reasoning using complete sentences.
