Question
P and Q can do a job in 90 days, Q and R can do it in
112.5 days, while P and R can do it in 150 days. X is five times as efficient as P, Y is two-thirds as efficient as Q, and Z is 2.5 times as efficient as R. Determine the number of days required to complete the same job if X, Y and Z work together.Solution
The correct answer is D
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