Mathematics, 07.01.2020 00:31, BaileyElizabethRay
Machine a can complete a certain job in x hours. machine b can complete the same job in y hours. if a and b work together at their respective rates to complete the job, which of the following represents the fraction of the job that b will not have to complete because of a's ? a) (x – y)/(x + y)b) x/(y – x)c) (x + y)/(xy)d) y/(x – y)e) y/(x + y)
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and machine B working rate is 
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