Question 1184425
.
Ali has hired Mark and Alexis to work for his shipping company. 
Mark can load a truck with packages in 120 minutes. 
Alexis can load the same number of packages in 240 minutes.
If Mark and Alexis work together on a particular truck, they can load all of the packages in 90 minutes.
~~~~~~~~~~~~~~~~



As you posed,  worded and presented the problem in your post,  it is   I N C O R R E C T.

This incorrect formulation confuses  YOU  and other readers.

THEREFORE,  I reformulate the problem   AS  IT  SHOULD  BE.


<pre>
    Ali has hired Mark and Alexis to work for his shipping company. 
    Mark can load a truck with packages in 120 minutes. 
    Alexis can load the same number of packages in 240 minutes.
    If Mark and Alexis work together, how long will it take to load a truck ?
</pre>


For this &nbsp;COPRRECTLY &nbsp;POSED &nbsp;PROBLEM, &nbsp;see my solution below.




<pre>
Mark makes  {{{1/2}}}  of the job per hour.  It is his rate of work.


Alexis makes  {{{1/4}}}  part of the job per hour.  It is his rate of work.


Working together, they make  {{{1/2 + 1/4}}} = {{{2/4 + 1/4}}} = {{{3/4}}}  of the job per hour.


It means that they will complete the entire job in  {{{4/3}}}  hours, working together.


{{{4/3}}}  hours is  1 hour and 20 minutes.


<U>ANSWER</U>.  They will complete the job in 1 hour and 20 minutes.
</pre>

Solved.


-----------------


.
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.


Also, &nbsp;you have this free of charge online textbook in ALGEBRA-I in this site

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-I - YOUR ONLINE TEXTBOOK</A>.


The referred lessons are the part of this textbook under the topic 
"<U>Rate of work and joint work problems</U>" &nbsp;of the section &nbsp;"<U>Word problems</U>".



Save the link to this online textbook together with its description


Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson


to your archive and use it when it is needed.



//////////////



When you present a problem to the forum, &nbsp;&nbsp;DO &nbsp;NOT &nbsp;MIX &nbsp;IT &nbsp;with your thoughts.


Do not make this soup.


Place these subjects SEPARATELY.