A) 10
B) 12
C) 15
D) 18
Correct Answer: B
Solution :
[b] 9 tap's one minute work\[=\frac{1}{20}\] 1 tap's one minute work\[=\frac{1}{180}\] Let x taps are used to fill the tank in 15 min, so \[x\times \frac{1}{180}=\frac{1}{15}\] \[x=\frac{180}{15}=12\] 12 taps can fill the tank in 15 min. |
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