Question 467979
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Hi,
Let x represent long it will take them to wash one car together
Question states*** Per hour the Equalizer
 1/1 + 1/2 = 1/x    |Multiplying thru by 2x so as all denominators = 1
  2x + 1x =  2
     3x = 2
      x = 2/3 hr OR 40min

CHECKING our Answer***
  {{{3/2 = 1/(2/3)= 3/2}}}