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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(3/5) days [Correct Answer] |
B. | 9(1/5) days [Wrong Answer] |
C. | 9(2/5) days [Wrong Answer] |
D. | 10 days [Wrong Answer] |