SOLUTION: Jack mows the grass in 7hrs. Jill can mow the same grass in 6 hrs. How long will it take if they mow it together?

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Question 200645: Jack mows the grass in 7hrs. Jill can mow the same grass in 6 hrs. How long will it take if they mow it together?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
7*6/(7+6)=42/13=3.23 hours working together.