SOLUTION: paul can split a cord of wood in 12 hours. his father can split a cord of wood in 4 hours. how long do paul and his father take to split a cord of wood if they work together?

Question 723916: paul can split a cord of wood in 12 hours. his father can split a cord of wood in 4 hours. how long do paul and his father take to split a cord of wood if they work together?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
paul can split a cord of wood in 12 hours. his father can split a cord of wood in 4 hours. how long do paul and his father take to split a cord of wood if they work together?
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In 1 hour, Paul does 1/12
In 1 hour, his father does 1/4
Together they do 1/12 + 1/4 = 1/3 per hour
1/3 per hour --> 3 hours to do the cord.

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