SOLUTION: Bob can overhaul a boat's diesel inboard engine in 15hrs. His apprentice takes 30hrs to do the same job. How long would it take them working together assuming no gain or loss in ef
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-> SOLUTION: Bob can overhaul a boat's diesel inboard engine in 15hrs. His apprentice takes 30hrs to do the same job. How long would it take them working together assuming no gain or loss in ef
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Question 824335: Bob can overhaul a boat's diesel inboard engine in 15hrs. His apprentice takes 30hrs to do the same job. How long would it take them working together assuming no gain or loss in efficiency?
multiple choice:
10hr
45hr
6hr
4hr Answer by milo1954(10) (Show Source):
You can put this solution on YOUR website! X = hrs to complete 1 engine
bob hrs + apprentice hrs = 1 engine
X/15 + X/30 = 1
multiply by 30
2X + X = 30
3X =30
X= 10
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