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Three ducts M, N and P can fill a tank in 18 hours. After working at it together for 6 hours, P is closed and M and N can fill the remaining part in 21 hours. The number of hours taken by P alone to fill the reservoir is: |
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Answer» Three ducts M, N and P can fill a tank in 18 hours. After working at it together for 6 hours, P is closed and M and N can fill the remaining part in 21 hours. The number of hours taken by P alone to fill the reservoir is: |
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