Kathleen can paint a room in 3 hours, and Anthony can paint an identical room in 4 hours. How many hours would it take Kathleen and Anthony to paint both rooms if they work together at their respective rates?	Choose one:
A) 8/15  B) 4/3  C) 15/8  D) 24/7  E) 15/4
(1/3 + 1/4)t=2   t=24/7   Answer: 24/7
<result>D</result>
Kathleen can paint a room in 3 hours, and Anthony can paint an identical room in 4 hours. How many hours would it take Kathleen and Anthony to paint both rooms if they work together at their respective rates?