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PIPES AND CISTERNS 

The problems in pipes and cisterns are almost the same as those of Time and Work problems, but with a bit difference as negative work comes into play due to leakage or drain pipes in the questions.

       Let us understand this with examples. 

 

Example 1.

                 If a pipe fills a tank in 10 hours and a leak in the bottom empties it in15 hours, when both function simultaneously  then


Net work is Positive.

Thus tank will be filled in 30 hours.

 

Example 2.

     If a pipe fills a tank in 5 hours and a leak empties in 4 hours, when both function simultaneously then
                        

Net work is Negative

Thus tank will be emptied in 20 hours

Posted Date : 23-09-2021

 

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