Question 384454
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Hi
Let x represent the time it takes together.
solo sue takes 1/3hr and Jerry 2/3hr  (twice as long)
Questions sets up the following. Per hour being the equalizer
  1/(1/3) + 1/(2/3)=1/x 
Mulitplying each term by 1/3*1/2*x so as all demonimators = 1
 (1/2)x + (1/3)x = 1/2*1/3
       5/6 x = 1/6 
          5x = 1
           x = 1/5hr , the time it takes together