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Pipe A can fill a tank in 12 hours, pipe B in 15 hours, and pipe C can empty it in 20 hours. If all three are opened together, in how many…

1053Medium DSSSB TGT Computer Science 0 replies 1 views
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Pipe A can fill a tank in 12 hours, pipe B in 15 hours, and pipe C can empty it in 20 hours. If all three are opened together, in how many hours will the empty tank be filled?

  • A10
  • B8
  • C12
  • D15
Correct answer: A

Explanation

Net rate = 1/12 + 1/15 − 1/20 = (5 + 4 − 3)/60 = 1/10, so it takes 10 hours.
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