Question 1204194
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One pipe alone can fill a tub in 12 minutes. Another pipe can fill it in only 8 minutes. 
How long would it take both piper to fill the tub
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<pre>
First pipe makes  {{{1/12}}}  of the job per minute.

Second pipe makes  {{{1/8}}}  of the job per minute.

Two pipes working together make  {{{1/12 + 1/8}}} = {{{2/24 + 3/24}}} = {{{5/24}}}  of the job per minute.

It means that two pipes will make the entire job in  {{{24/5}}} minutes = {{{4}}}{{{4/5}}} minutes = 4 minutes and 48 seconds.
</pre>

Solved.


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It is a standard and typical joint work problem.


There is a wide variety of similar solved joint-work problems with detailed explanations in this site. &nbsp;See the lessons

&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> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Solving-more-complicated-word-problems-on-joint-work.lesson>Solving more complicated word problems on joint work</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Selected-problems-from-the-archive-on-joint-work-word-problems.lesson>Selected joint-work word problems from the archive</A> 


Read them and get be trained in solving joint-work problems.