Question 1203286
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how long does it take to fill a reservoir with the intake pipes a and b, 
if the reservoir can be filled by a alone in 5 days and by b alone in 3 days
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<pre>
Pipe A fills  {{{1/5}}}  of the reservoir volume per day.


Pipe B fills  {{{1/3}}}  of the reservoir volume per day.


Working together, the two pipes fill  {{{1/5 + 1/3}}} = {{{3/15 + 5/15}}} = {{{8/15}}}  of the reservoir volume per day.


Hence, the two pipes will fill the reservoir in  {{{15/8}}}  days working together.   <U>ANSWER</U>
</pre>

Solved.


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It is a standard &nbsp;" joint work " &nbsp;problem.


To see many other similar &nbsp;(and different) &nbsp;typical problems of this kind,

solved with short, &nbsp;clear and complete explanations, &nbsp;see the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Word-problems-WORKING-TOGETHER-by-Fractions.lesson>Using Fractions to solve word problems on joint work</A> 

in this site.


Read it and learn the subject from there once and for all.


Do not miss this yours a &nbsp;UNIQUE &nbsp;chance.