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It takes person A 3 hours to do one lawn, thus in one hour they do one-third of a lawn. It takes person B 2 hours to do one lawn, thus in one hour they do one-half of a lawn. Together in one hour, they do 1/3 + 1/2 = 5/6 of a lawn; at this rate, it will take them 6/5 = 1.2 hours, or 1 hour and 12 minutes, to do one whole lawn together.

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Q: If it takes a person to mow a loan in 3 hours and it take another person 2 hours to mow the loan how long will it take them together?
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