1.

A cistern can be filled separately by two pipes in 12 and 16 minutes separately. If both fill pipes are opened together, when will the cistern be filled?

A.  \[{{V}_{0}}\]min 
B.  \[4\frac{6}{7}\]min
C.  \[{{V}_{n}}={{V}_{0}}{{\left( 1-\frac{R}{100} \right)}^{n}}.\]min 
D.   \[4\frac{1}{2}\] min
Answer» D.   \[4\frac{1}{2}\] min


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