Question
It takes Machine R and Machine B 30 minutes to print a total of 1920 copies of brochures. Machine R can print 30 copies of brochures in one minute. How many copies of brochures can Machine S print per minute?
2 m

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It takes Machine R and Machine B 30 minutes to print a total of 1920 copies of brochures. Machine R can print 30 copies of brochures in one minute. How many copies of brochures can Machine S print per minute?