Q: Working alone, Printers X, Y, and Z can do a certain printing job, consisting of a large number of pages, in 12, 25, and 30 hours, respectively. What is the ratio of the time it takes Printer X to do the job, working alone at its rate, to the time it takes Printers Y and Z to do the job, working together at their individual rates?\nOptions:\n(A)  4/11\n(B)  1/2\n(C)  15/22\n(D)  150/11\n(E)  11/4 Let's give some random thoughts before answering.
User
P1 takes 12 hrs\nRate for P2P3 together = 1/25 + 1/30 = 11/150\nTherefore they take 150/11\nRatio = 150/11 =
Therefore, the answer is (D).
Assistant