In what time will the cistern be emptied?

A tap can fill a cistern in 12 minutes while another tap B can empty it in 8 minutes. The tap A is kept open for 6 minutes in the beginning and then the second tap B is also opened. In what time will the cistern be emptied?

  1. 10 minutes
  2. 12 minutes
  3. 15 minutes
  4. None of these
Anurag Mishra Professor Asked on 11th February 2016 in Maths.
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