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# Two pipes A and B can fill a tank in 18 and 6 h, respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?

 A) $$\Large 4\frac{1}2{}$$ h B) 7 h C) 6 h D) 10 h

 A) $$\Large 4\frac{1}2{}$$ h

Part filled by A in 1 h = $$\Large 3 \times \frac{1}{18}$$

Part filled by B in 1 h = $$\Large \frac{1}{6}$$

Part filled by (A + B) =

$$\Large \frac{1}{18}$$+$$\Large \frac{1}{6}$$ = $$\Large \frac{1+3}{18}$$ = $$\Large \frac{4}{18}$$ = $$\Large \frac{2}{9}$$

Here, both the pipes together will fill the tank in $$\Large \frac{9}{2}$$ h or $$\Large 4\frac{1}{2}$$

Part of solved Pipes and Cisterns questions and answers : >> Aptitude >> Pipes and Cisterns

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