Pipes and Cistern - Arithmetic Aptitude Questions and Answers

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Discussion :: Pipes and Cistern

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

1 $\frac { 13 } { 17 }$ hours

2 $\frac { 8 } { 11 }$ hours

3 $\frac { 9 } { 17 }$ hours

4 $\frac { 1} { 2 }$ hours

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Answer : Option C

Explanation :

Net part filled in 1 hour [ $\frac { 1 } { 5 }$ + $\frac { 1 } { 6 }$ - $\frac { 1 } { 12 }$ ] = $\frac { 1 7} { 60 }$

The tank will be full in $\frac { 60} { 17 }$ hours hours i.e., 3 $\frac { 9} { 17 }$ hours

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