Question
It takes Machine S and Machine B 15 minutes to print a total of 690 copies of catalogs. Machine S can print 20 copies of catalogs in one minute. How many copies of catalogs can Machine T print per minute?
2 m

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It takes Machine S and Machine B 15 minutes to print a total of 690 copies of catalogs. Machine S can print 20 copies of catalogs in one minute. How many copies of catalogs can Machine T print per minute?