Pipes and Cistern - Arithmetic Aptitude Questions and Answers

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Discussion :: Pipes and Cistern

Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:

60 gallons

100 gallons

120 gallons

180 gallons

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Answer : Option C

Explanation :

= [ $\frac { 1 } { 15 }-$ $\frac { 11 } { 120 }]$

=- $\frac { 1 } { 40 }$ . [-ve sign means emptying

Volume of $\frac { 1 } { 40 }$ Part =3 gallons

Volume of whole = (3 x 40) gallons = 120 gallons.

Work done by the waste pipe in 1 minute =

$\frac { 1 } { 15 }-$ [

$\frac { 1 } { 20 }+$

$\frac { 1 } { 24}]$

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