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Filling a pool with a hose takes nine hours While draining The pool takes 14 hours. If the drain is open how long does to fill the pool in hours

 Feb 27, 2020
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Note  that  in  one  hour.....the portion of the pool that  is filled  =  [1/9 - 1/14 ] =

 

[14  - 9  ]  / [ 14* 9 ]  =

 

5 / 126

 

The reciprocal of this tells us  the  number of hours it takes to  fill the pool   =

 

 

126/5  =   25 + 1/5   hours  =   25 hours and 12 minutes

 

 

cool cool cool

 Feb 27, 2020

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