document.write( "Question 1163733: One crew can seal a parking lot in 8 hours and another 12 hours. How long will it take to seal parking lot if the two crews work together? \n" ); document.write( "
Algebra.Com's Answer #787914 by Alan3354(69443)\"\" \"About 
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One crew can seal a parking lot in 8 hours and another 12 hours. How long will it take to seal parking lot if the two crews work together?
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\n" ); document.write( "8*12/(8+12) = 4.8 hours
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\n" ); document.write( "Not good for a PhD dissertation, or even Master's Thesis.
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