Task: Question Answering
Input (English): Problem: kathleen can paint a room in 4 hours , and anthony can paint an identical room in 5 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 ) 40 / 9 , c ) 15 / 8 , d ) 9 / 4 , e ) 15 / 4
Output (English): b