Three pipes P,Q and R can fill a tank in 6 hours. After working all three together for 2 hours. R is closed and P and Q can fill the remaining part in 7 hours . The number of hours taken by R alone fill the thank is --

Created: 5 months ago | Updated: 3 months ago
Job Solution Islami Bank Bangladesh Ltd (IBBL) Probationary Officer | 31.03.2017 গণিত
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