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Q: Pipe 1 can empty a tank in 6 h while pipe 2 can do so in 18 h. If both are working together, in how much time they will empty the full tank?
  • A. 10 h
  • B. 5 h
  • C. 9 h
  • D. 4.5 h
Correct Answer: Option D -
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Explanations:

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