A pipe can empty a tank in 12 minutes and another pipe can

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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 ?

1. 6 minutes
2. 6¹/₇ minutes
3. 6²/₇ minutes
4. None of these

Correct Option: D

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