document.write( "Question 446147: Two contractors were working together to finish concrete. One can finish 25 square yards in 4 hours. The other can finish 25 square yards in 5 hours. How much concrete can they finish in 8 hours working together? \n" ); document.write( "
Algebra.Com's Answer #307270 by Alan3354(69443)\"\" \"About 
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The 1st does 25/4 per hour.
\n" ); document.write( "The 2nd does 25/5 per hour.
\n" ); document.write( "Together, they do 25/4 + 5 per hour
\n" ); document.write( "--> 45/4 per hour * 8 hours
\n" ); document.write( "= 90 sq yds
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