Air Purifying Machines (Combined Rate) Welcome! You are encouraged to register with the site and login (for free). When you register, you support the site and your question history is saved.Machines and purify air at different constant rates. Machine , operating alone for 5 hours, purified the air within part of one floor of a building; then Machine , operating alone for 4 hours, purified the air within the rest of the floor. How many hours would it have taken Machine operating alone to purify the air in the entire floor?(1) purified one cubic foot of air per minute within the 9 rooms on the floor it purified.(2) purified fifty percent more air in 5 hours than purified in 4 hours. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. EACH statement ALONE is sufficient. Statements (1) and (2) TOGETHER are NOT sufficient. Review Answer