Question 755002
From this part, "3 painters took 15 hours to paint a house.", determine how long it took 1 painter to paint the house, assuming each painter uses the same rate.  One painter needs three times longer than all three working together.  What is 3 times 15?  
45 hours for 1 painter to paint the house.  


Now you want the time for 9 painters?  Their rates are simply added.