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15 June, 05:37

Jack and Fred have to do a certain job. If Jack works alone he can finish the job in 3 hours. If Fred works alone he can finish the job in y hours. The two of them can finish the job in 2 hours if they work together. What is the value of y?

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  1. 15 June, 08:38
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    I think that would mean y=1, since Jack can get the job done in 3 hours. If Fred can get it done in 1 hour, then that would subtract an hour off of Jack's work. 3 hours - 1 hour = 2 hours.
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