SOLUTION: Please help me on this Algebra 2 problem: John can build a deck in 4 days. Tim can build a deck in 7 days. How long will it take them if they work together? I'm not sure how

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Question 453217: Please help me on this Algebra 2 problem:
John can build a deck in 4 days. Tim can build a deck in 7 days. How long will it take them if they work together?
I'm not sure how to do this.. Ratio or something? Divide 7/4 to get 1.75?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
John does 1/4 deck per day
Tim does 1/7 per day
Together, they do 1/4 + 1/7 per day = 11/28 decks per day
--> 28/11 days per deck