A) 38
B) 22
C) 42
D) 45
Correct Answer: D
Solution :
[d] Let the number of minutes taken to empty the cistern be x min. According to the question, \[\frac{x}{6}-\frac{x+5}{12}=\frac{x+5}{15}=0\] \[\Rightarrow \] \[\frac{x}{6}-\frac{x}{12}-\frac{x}{15}=\frac{5}{12}+\frac{5}{15}\] \[\Rightarrow \] \[\frac{x}{60}=\frac{45}{60}\] \[\Rightarrow \] \[x=45\min \] |
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