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John can mow the lawn in 9 hours. His younger brother can do it in 6 hours. How long does it take the two of them when working together?

John can mow the lawn in 9 hours. His younger brother can do it in 6 hours. How long does it take the two of them when working together?
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John can mow the lawn in 9 hours. His younger brother can do it in 6 hours. How long does it take the two of them when working together?

User Marco Lackovic
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1 Answer

3 votes
Wouldn’t it be about 6 hours?
User MSeifert
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