P can lay railway track between two stations in 16 days.... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

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?

Correct answer: A

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