Question
It takes Machine H and Machine B 40 minutes to print a total of 1720 copies of business cards. Machine H can print 18 copies of business cards in one minute. How many copies of business cards can Machine J print per minute?
2 m

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It takes Machine H and Machine B 40 minutes to print a total of 1720 copies of business cards. Machine H can print 18 copies of business cards in one minute. How many copies of business cards can Machine J print per minute?