A) 6
B) 8
C) 9
D) 4
Correct Answer: B
Solution :
Let B be closed after x min. Then, [Part filled by (A + B) in x min]+ Pan filled by A in \[(18-x)\,\,min=1\] \[\therefore \]\[x\left( \frac{1}{24}+\frac{1}{32} \right)+(18-x)\times \frac{1}{24}=1\] \[\Rightarrow \]\[\frac{7x}{96}+\frac{18-x}{24}=1\]\[\Rightarrow \]\[7x+4\,\,(18-x)=96\] \[\Rightarrow \]\[3x=24\]\[\Rightarrow \]\[x=8\] Hence, B should be closed after 8 min.You need to login to perform this action.
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