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With both presses running the job takes 4 hours. Press #1 alone takes 6 hours, so Press #2 alone takes:
A8 hours
B14 hours
C12 hours
D10 hours
Answer & Solution
Correct answer: C. 12 hours
1. Together they do one fourth an hour.
2. Press #1 does one sixth, leaving one twelfth.
3. Press #2 alone takes 12 hours.
_Source: OpenStax Elementary Algebra, Chapter 8, Solve Uniform Motion and Work Applications._
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