Hi,

one painter can paint a room in 12 hours and another can paint the same room in 10 hours. 

How long 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) 

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