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A can lay railway track between two give...

A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With the help of C, they did the job in 4 days only. Then, C alone can do the job in `9 1/5d a y s` b. `9 2/5d a y s` c. `10\ d a y s` d. `9 3/5d a y s`

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