SOLUTION: Fred can stock the shelves of the canned vegetable aisle in 5 hours. Wanda can stock the same shelves in 4 hours. How long would it take Fred and Wanda working together to stock th

Question 1027977: Fred can stock the shelves of the canned vegetable aisle in 5 hours. Wanda can stock the same shelves in 4 hours. How long would it take Fred and Wanda working together to stock the shelves?
(Include units with your numerical answer. Round your answer to one decimal place.)
It would take______for Fred and Wanda working together to stock the shelves.

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Fred can stock the shelves of the canned vegetable aisle in 5 hours. Wanda can stock the same shelves in 4 hours. How long would it take Fred and Wanda working together to stock the shelves?
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Fred does 1/5 of the shelf per hour.
Wanda does 1/4 per hours.
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Together, they do 1/5 + 1/4 per hour = 9/20 per hour.
--> 20/9 hours per shelf

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