DSSSB · Mathematics

Two inlet pipes can fill a tank in 18 minutes and 24 minutes respectively, while one outlet pipe can empty the filled tank in 36 minutes. All the pipes are opened simultaneously, but after some time the exhaust pipe is closed, due to which the tank is completely filled in a total of 12 minutes. After how many minutes was the exhaust pipe closed?

  1. 8
  2. 7
  3. 6
  4. 5
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