Discussion :: Pipes and Cistern
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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:
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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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