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Nikhil is thrice as efficient as Kanak. Together they finish some work. Find the number of days to complete alone.

1. 6 days
2. 7 days
3. 8 days
4. 9 days

Correct answer: 9 days

Solution

With Nikhil being 3× as efficient as Kanak, if their combined rate leads to the given completion time, solving gives Kanak takes 9 days (or the specified person takes 9 days).

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