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题目来源：
OG详解-OG1 数学1 Q6
正确答案：2,520
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The correct answer is 2,520. There are 60 minutes in one hour. At a rate of 42 posters per minute, the number of posters produced in one hour can be determined by (42 posters1 minute)(60minutes1 hour) , which is 2,520 posters per hour.
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