Question 970227
.
Joe paints 1 house/6 hours=1/6 house/hour
Bill paints 1 house/6 hours=1/6 house/hour
Together: 1/6 house/hour+1/6 house/hour=2/6 house/hour=1/3 house/hour
1 house/(1/3 house/hour)=3 hours
ANSWER: It would take Bill and Joe 3 hours to paint a house together.