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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?
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Jake = j+9 j + j+9 = 20
2j = 11 j = 11/2 = 5.5 hours .... this doesnt look likeits gonna work out lke i thought lol
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.
ahhh.... i didnt do reciprocals lol
darn cuz i had the same answer as amistre....so what the answer if that doesnt work out?
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