Question 622324
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Hi,
one painter can paint a room in 12 hours and another can paint the same room in 10 hours. 
How long {{{highlight(x)}}}will it take to paint the room if they work together?
Work PER hour KEY
 1/12 + 1/10 = 1/x     |Multiplying thru by 60x so as all denominators = 1
  5x + 6x = 60 
     11x = 60
       x = 5.45 hrs (rounded to 2 decimal points)