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A pipe can empty a tank in 12 minutes and another pipe can empty it in 16 minutes. If both the pipes are opened simultaneously, find the time in which a full tank is emptied?

6 minutes
61/7 minutes
62/7 minutes
None of these

Correct Answer: None of these

Explanation:

Required answer = (12 x 16) /(12 + 16) = 48 / 7 = 6⁶/₇ minutes.

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