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Q: Pipe A and B can empty a full tank in 20 and 15 hours respectively wherever C can full the tank alone in x hours. Three pipes are open together at the same time and to empty (1/18)th part of the tank it taken 40 min. What is the value of x.
  • A. 21 hours
  • B. 30 hours
  • C. 26 hours
  • D. 24 hours
Correct Answer: Option B -
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Explanations:

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