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Two pipes can fill a tank in 15 hours and 20 hours respectively, while the third can empty it in 30 hours. If all the pipes are opened simultaneously, the empty tank will be filled in
  • a)
  • b)
    10 hours
  • c)
    12 hours
  • d)
    15 hours
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Two pipes can fill a tank in 15 hours and 20 hours respectively, while...
Using Rule 2,
Part of tank filled in 1 hour when all three pipes are opened simultaneously

Hence, the tank will be filled in 12 hours.
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