Working at a constant rate, P can finish a job in 3 hours. Q, also working at a constant rate, can finish the same job in 9 hours. If they work together for 2 hours, how many more minutes will it take P to finish the job, working alone at his constant rate?	Choose the correct option:
A) 20  B) 30  C) 40  D) 50  E) 60
Each hour they complete 1/3 + 1/9 = 4/9 of the job.   In 2 hours, they complete 2(4/9) = 8/9 of the job.   The time for P to finish is (1/9) / (1/3) = (1/3) hour = 20 minutes   The answer is 20.
<result>A</result>
Working at a constant rate, P can finish a job in 3 hours. Q, also working at a constant rate, can finish the same job in 9 hours. If they work together for 2 hours, how many more minutes will it take P to finish the job, working alone at his constant rate?