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 tank is --

BUET GTCL Technician PSC PMG Northern Region – Postal Operator - 2023 GTCL Technician - 2023 গণিত আয়তক্ষেত্রের ক্ষেত্রফল

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