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 all did the job in 4 days only .In how many days , C alone can finish the work
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https://www.meritnation.com/ask-answer/question/a-can-do-a-job-in-20-days-and-b-can-do-the-same-job-in-1/direct-and-inverse-variations/9741181
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