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Tanush’s firm can lay railway track between two stations in 16 days. Navansh’s firm can do the same job in 12 days. With the help of Vridhi’s firm, all can lay the track in 4 days. How many days will it take for Vridhi’s firm alone to complete the work?

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Tanush’s firm can lay railway track between two stations in 16 days. Navansh’s firm can do the same job in 12 days. With the help of Vridhi’s firm, all can lay the track in 4 days. How many days will it take for Vridhi’s firm alone to complete the work?






 
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