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X and Y do a job together in two hours.Working alone X does the job in 5 hours.How long will it take Y to do the job alone?

 Jul 13, 2020
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These questions are st up like this:

 

1/x + 1/y = 1/ t         t = 2 hours

1/5  + 1/y = 1/2        solve for y...the time for y alone

 Jul 13, 2020

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