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02.09.2021 • 
Mathematics

Two machines in a car parts factory mold different parts that will eventually be put together in an assembly plant. The first machine makes a part every 12 seconds, and the second machine makes a part every 45 seconds. The quality control engineer tests these parts each time they both come out of the machines at the same time. How often does she test the parts? Show your work and express your answer in minutes.

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