Question 1134198
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 Working alone , Tom takes three times as long as Jim 
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3j, time for Tom
j, time for Jim



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Jim and Tom , working together , can weed the garden in 3 hours.
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{{{1/(3j)+1/j=1/3}}}

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{{{3j(1/(3j)+1/j)=3j(1/3)}}}

{{{1+3=j}}}

{{{highlight(4=j)}}}-------------Jim would need 4 hours, working alone.