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If it takes Bob 4 hours to build a table, Sue 6 hours to build a table, and Jim 12 hours to build a table, how long will it take them to build a table together, assuming they do not hinder each other in any way?

 Jul 20, 2020
 #1
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Bob rate   1 table /4hr  = 1/4

Sue rate   = 1/6

Jim rate  = 1/12

 

Build 1 table          1  /  (1/4 + 1/6 +1/12 )   hr   = 2 hours 

 Jul 20, 2020

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