document.write( "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? \r
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\n" ); document.write( "\n" ); document.write( "It would take______for Fred and Wanda working together to stock the shelves.
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Algebra.Com's Answer #643172 by Alan3354(69443)\"\" \"About 
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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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\n" ); document.write( "Fred does 1/5 of the shelf per hour.
\n" ); document.write( "Wanda does 1/4 per hours.
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\n" ); document.write( "Together, they do 1/5 + 1/4 per hour = 9/20 per hour.
\n" ); document.write( "--> 20/9 hours per shelf
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