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Working at their individual same constant rate, 24 machines can complete a certain production job in 10 hours when they

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by Vincen » Wed Jun 02, 2021 10:06 am
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Working at their individual same constant rate, 24 machines can complete a certain production job in 10 hours when they all work together. On a certain day, due to minor malfunction, 8 of those machines were not operating for the first 2 hours. Compared to normal days, what is the extra time taken to complete the production job on that day?

A. 20 minutes
B. 30 minutes
C. 40 minutes
D. 1 hour
E. 1 hour 20 minutes

Answer: C

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