A) 15 min
B) \[18\frac{2}{3}\]min
C) 20 min
D) 25 min
Correct Answer: C
Solution :
[c] \[\because \]1 h work of pipe\[A=\frac{1}{4}\] and 1 h work of pipe\[B=\frac{1}{5}\] \[\therefore \]1 h work of both pipes\[=\frac{1}{4}-\frac{1}{5}=\frac{1}{20}\] Hence, both pipes working together, fill the tank in 20 min. |
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