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Unformatted text preview: open, how long will it take to fill the empty tank? 5. Linda and John Franco own a house cleaning service. When Linda cleans Damons house by herself, it takes 7 hours. When Linda and John work together, they can clean the house in 4 hours. How long will it take John to clean the house by himself? 6. Dave and Sandy are frequent flyers with American Airlines. They often fly from Philadelphia to Chicago, a distance of 780 miles. On one particular trip they fly into the wind and the flight takes 2 hours. The return trip, with the wind behind them only takes 1 hours. Find the speed of the wind and find the speed of the plane in still air....
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 Fall '11
 JanetFrewing
 Math

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