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Bob can overhaul a boat's diesel inboard engine in 30 hours. His apprentice takes 60 hours to do the same job. How long would an
Bob can overhaul a boat's diesel inboard engine in 30 hours. His apprentice takes 60 hours to do the same job. How long would an overhaul take with them working together?
Select one:
A. 8 hr
B. 20 hr
C. 90 hr
D. 12 hr
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