Hi

Let x represent the minutes it takes together to shovel the driveway

question states***per minute being the equalizer

  1/50 + 1/20 = 1/x  |Multiplying thru with 100x so as all denominators= 1

  2x + 5x = 100

     7x = 100

      x = 100/7 = 14.2857 min 

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