Kathleen can paint a room in 2 hours, and Anthony can paint an identical room in 3 hours. How many hours would it take Kathleen and Anthony to paint both rooms if they work together at their respective rates?	Options
A) 8 / 15
B) 4 / 3
C) 12 / 5
D) 9 / 4
E) 15 / 4

Rationale: "( 1 / 2 + 1 / 3 ) t = 2 t = 12 / 5 answer : c"
Answer: C