A) 17
B) 11
C) 15
D) 16
Correct Answer: B
Solution :
Suppose A takes x minutes more after 5 minutes of working together with B to fill the cistern then, \[\frac{5}{25}+\frac{5+x}{20}=1\] \[\Rightarrow \,\,\,\,20+25+5x=100\]\[\Rightarrow \,\,\,\,x=\]11 minutesYou need to login to perform this action.
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