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 --
A. 10
B. 12
C. 14
D. 16
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সঠিক উত্তরঃ
C.
14
Explanation:
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