P can lay railway track between two stations in 16 days. Q can do the same job in 12 days. With the help of R, they completes the job in 4 days. How much days does it take for R alone to complete the work?
A. 9(2/5) days
B. 9(1/5) days
C. 10 days
D. 9(3/5) days
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