document.write( "Question 245846: If a machine A makes 1000 gidgets in 4 hours, and machine B makes 1000 gidgets in 8 hours, how long will it take both machines to make 1000 gidgets?? \n" ); document.write( "
Algebra.Com's Answer #179520 by Alan3354(69443)\"\" \"About 
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Use the shortcut product/sum
\n" ); document.write( "= 8*4/(8+4) = 32/12
\n" ); document.write( "t = 8/3 hours = 2 hr 40 minutes
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