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 ?
"( 1 / 3 + 1 / 4 ) t = 2 t = 24 / 7 answer : d"
multiply(divide(const_1, add(divide(const_1, 3), divide(const_1, 4))), const_2)