A group of college students is volunteering for Homes for the Community during their spring break. They are putting the finishing touches on a house they built. Working alone, Wade can paint a certain room in 5 hours. Rhonda can paint the same room in 4 hours. How long will it take them working together to paint the room? Round your answer to the nearest hundredth if necessary.

Question

anonymous · Answer

quick answer is 
$$\frac{5\times 4}{5+4}$$