2 years ago in Time and Work

# A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:

[A] 9 <sup>1</sup>/<sub>5</sub> days
[B] 9 <sup>2</sup>/<sub5>7</sub> days
[C] 9 <sup>3</sup>/<sub>5</sub> days
[D] 10

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