A) \[9\frac{1}{7}\] minutes
B) \[3\frac{1}{3}\] minutes
C) 5 minutes
D) \[3\,\] minutes
E) None of these
Correct Answer: A
Solution :
Explanation Option [a] is correct. Let cistern will be full in x min. Then, part filled by B in x min + part filled by A in (x ? 4) min = 1 \[\Rightarrow \,\frac{x}{16}+\frac{x-4}{12}=1\] \[\Rightarrow \,x+\frac{64}{7}=9\frac{1}{7}\min .\]You need to login to perform this action.
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