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 - QAmmunity.org

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

asked Dec 26, 2022 76.7k views

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