Question 386106
      
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Hi,         
Let x represent the time to deliver 36 papers
Question SetsUp the Proportion
{{{80/4 = 36/x}}}
Cross mulitply to solve for x
 80x = 4*36
   x = 4*36/80 = 1.8 hrs

CHECKING OUR ANSWER
  80/4 = 20 = 36/1.8