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Jack and Serena can write a lab report together in 12 hours. If all people work at the same rate, how many hours would it take to write a lab report if Kay joins Jack and Serena?

 

P.S.

Any other solution before this is wrong.crying

 Aug 16, 2022
 #1
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1/J  +  1/S ==1/12

 

But J == S

 

1/J  +  1/J ==1/12, solve for J

J == 24 hours - time it takes Jack working alone to write the lab report

S == 24 hours - ...................Serena..........................................................

 

Kay ==24 hours as well:

 

Therefore: Jack, Serena and Kay would finish the report in:

 

3 / 24 ==8 hours

 Aug 16, 2022
 #2
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Thanks!

Guest Aug 16, 2022

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