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Machine \(R\) and machine \(S\) work at their respective constant rates. How much time does it take machine \(R,\) working alone, to complete a certain job?
(1) The amount of time that it takes machine \(S,\) working alone, to complete the job is \(3/4\) the amount of time that it takes machine \(R,\) working alone, to complete the job.
(2) Machine \(R\) and machine \(S,\) working together, take \(12\) minutes to complete the job.
[spoiler]OA=C[/spoiler]
Source: Official Guide
(1) The amount of time that it takes machine \(S,\) working alone, to complete the job is \(3/4\) the amount of time that it takes machine \(R,\) working alone, to complete the job.
(2) Machine \(R\) and machine \(S,\) working together, take \(12\) minutes to complete the job.
[spoiler]OA=C[/spoiler]
Source: Official Guide
