Funny, it doesn't look like an electrical problem
Algebra
Level
2
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?
The answer is 2.
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1 solution
This is analogous to a parallel circuit, where Time is the 'Resistance' to getting the job done. Therefore: 1/T=(1/4)+(1/6)+(1/12) T=2