Hi,         

Let x represent the time it would take for 2 men to pave the 10 miles

Question Sets Up the Proportion: 

takes 3 men 5 days to pave 'one mile' of road, therefore:

It takes  5*10 or 50 days for 3 men to pave 10 miles.

  

Cross Multiply to solve for x

  3x = 100

   x = 33 1/3 days 

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