Question 432570
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Hi
Let x represent time it would take them to paint it together
Question states*** Per hour the Equalizer
  1/4 + 1/6 = 1/x   |Multiplying thru by 12x so as all denominators = 1
  3x + 2x = 12
     5x = 12
      x = 12/5 or  2.4 hrs

CHECKING our Answer***
 1/4 + 1/6 = 3/12 + 2/12 = 1/(12/5) = 5/12