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ianmorales4894
07.01.2020 •
Mathematics
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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Ответ:
Step-by-step explanation:
The required answer is the rate at which Machine A works when the two machines are combined.
Note: the rate of doing work is express as
Hence we can conclude that Machine A working rate is
When the two machine works together, the effective working rate is
The fraction of the work that Machine B will not have complete because of Machine A help is the total work done by machine A
Hence the fraction of work done by A is expressed as
Hence the fraction of the work that Machine B will not have complete because of Machine A help is the total work done by machine A is![\frac{y}{x+y} \\](/tpl/images/0444/8717/17398.png)
Ответ:
idk
Step-by-step explanation: