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Official Guide
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.
OA C
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.
OA C
