Hi,

takes Andrew 4 hours to clean the kitchen at camp. Daniel 3hrs...

How long  will it take them to clean it if they work together?

Note:  PER hour is the Key

  1/4 + 1/3 = 1/x     |Multiplying thru by 12x so as all denominators = 1

   3x+ 4x = 12

   7x = 12

    x = 12/7 hr 

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