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Three pipes P, Q and R can fill a tank in 12 hours. After working at it together for 4 hours, R is closed. P and Q can fill the remaining tank in 14 hours. What is the number of hours taken by R alone to fill the tank? |
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Answer» Three pipes P, Q and R can fill a tank in 12 hours. After working at it together for 4 hours, R is closed. P and Q can fill the remaining tank in 14 hours. What is the number of hours taken by R alone to fill the tank? |
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