Question
It takes Machine P and Machine B 50 minutes to print a total of 2400 copies of posters. Machine P can print 21 copies of posters in one minute. How many copies of posters can Machine Q print per minute?
2 m

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It takes Machine P and Machine B 50 minutes to print a total of 2400 copies of posters. Machine P can print 21 copies of posters in one minute. How many copies of posters can Machine Q print per minute?