Asked by Tina

A farmer can plow a given field in 7 hours. If his son helps him, they can plow the field together in 4 hours. How long would it take his son to plow the field alone? Express your answer as a fraction reduced to lowest terms, if needed.
Answered by Steve
If the son takes x hours,

1/7 + 1/x = 1/4
Answered by Anonymous
10
Answer
28/3
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