Question 437261
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Hi
Let x represent time it would take together
Question states*** Per hour being the equalizer
  1/3 + 1/5 = 1/x  Multiplying thru by 15x so as all denominators=1
   5x + 3x = 15
     8x = 15
      x = 15/8 or 1 7/8 hrs, time it would take together

CHECKING our Answer***
  5/15 + 3/15 = 1/(15/8) = 8/15