Question 954952
Carpenter, {{{1/32}}}
Second Carpenter, {{{1/40}}}
Both Together, {{{1/32+1/40}}}


Manage denominators later.


RT=J, where J is how many desks or desk,  rate R, time T.

A uniform work rates situation.


{{{(1/32)8+(1/32+1/40)t=1}}}.
That is what you want to be able to say.  t is the amount of time that both carpenters work together while finishing the desk.
Now, you can multiply the left and right members of the equation by lowest common denominator and continue simplification to solve for t.  



LCD is {{{2*2*2*2*2*5}}}.