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 18 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 answer:
A) 32
B) 36
C) 40
D) 44
E) 48
Each hour they complete 1/3 + 1/18 = 7/18 of the job.   In 2 hours, they complete 2(7/18) = 7/9 of the job.   The time for P to finish is (2/9) / (1/3) = (2/3) hour = 40 minutes   The answer is 40.
<result>C</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 18 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?