Answer: It would take them together 3 hr 12.5 minutes rounded.
Step-by-step explanation:.
Picture, if a 45 square foot room, Sally is painting at 5 sq' per hour, Steve paints it at 9sq' per hour. Combined they are painting at the rate of 14 square feet per hour. Divide the 45 square foot room by 14 and get 3.21 hours converted to 3 hour 12 minutes approximate. It doesn't matter the size of the room as long as you do all three steps. The answer is always the same.