anonymous
  • anonymous
It takes Jake 9 hours longer than Joe to rebuild an engine. Working together, they can do the job in 20 hours. How long would it take each, working alone, to rebuild an engine?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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amistre64
  • amistre64
Jake = j+9 j + j+9 = 20
amistre64
  • amistre64
2j = 11 j = 11/2 = 5.5 hours .... this doesnt look likeits gonna work out lke i thought lol
anonymous
  • anonymous
let jack do in a hr. and joe in a+9 hr. in one hr both they do 1/a+1/(a+9). so 20(1/a +1/(a+9))=1 will give you a.

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amistre64
  • amistre64
ahhh.... i didnt do reciprocals lol
anonymous
  • anonymous
darn cuz i had the same answer as amistre....so what the answer if that doesnt work out?

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