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
Correct Answer: C
Solution :
\[\Rightarrow \] The cistern will be filled in\[{{a}_{1}}:{{a}_{2}}::{{b}_{1}}:{{b}_{2}}\]min\[{{a}_{1}}:{{a}_{2}}={{b}_{1}}:{{b}_{2}}\] mm.
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