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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:

A

`9(1)/(5)` days

B

`9(2)/(5)` days

C

`9(3)/(5)` days

D

`9(4)/(5)` days

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