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It takes one minute to fill 2/7 th of a vessel. What is the time taken in minutes to fill the whole of the vessel ?

1/7 min
7/2 min
5/7 min
7/5 min

Correct Answer: 7/2 min

Explanation:

Time taken to fill 2/7 = 1
Then to fill full 1 = ?
? = 1/(2/7) = 7/2 minutes.

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