document.write( "Question 642858: a farmer can plow a certain field three times as fast as his son. working together it will take them 6 hours to plow the field. how long would it take for his son to plow the field alone? \n" ); document.write( "
Algebra.Com's Answer #404251 by htmentor(1343)\"\" \"About 
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The son can plow x fields per hr
\n" ); document.write( "The father can plow 3x fields per hr
\n" ); document.write( "Working together, they can plow x + 3x = 1/6 fields/hr
\n" ); document.write( "4x = 1/6
\n" ); document.write( "x = 1/24 fields/hr
\n" ); document.write( "So the son would take 24 hours to plow the field alone
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