Working alone, Printers X, Y, and Z can do a certain printing job, consisting of a large number of pages, in 12, 40, and 50 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)  200/9\n(E)  11/4 Stream of consciousness first, then make a decision:
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P1 takes 12 hrs\nRate for P2P3 together = 1/40 + 1/50 = 9/200\nTherefore they take 200/9\nRatio = 200/9 =
Thus, the answer is (D).
Assistant