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Q: A tank has two pipes. Pipe M is to fill the tank and pipe N is to empty the tank. If pipe M takes 45 hours to fill the tank completely and N takes 90 hours to empty the tank completely. Then how much time will it take to fill the half empty tank?
  • A. 45 hours
  • B. 35 hours
  • C. 60 hours
  • D. 40 hours
Correct Answer: Option A -
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Explanations:

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