DSSSB · Mathematics

Two pipes can fill a tank in 20 hours and 30 hours respectively, while the third pipe can empty a completely filled tank in 36 hours. If all the pipes are opened together when the tank is empty, then in how much time will the tank be filled?

  1. 21 hours
  2. 24 hour
  3. 18 hours
  4. 12 hours
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