document.write( "Question 396116: It takes Mang kaloy 3 hours to plow his ricefield with his new tractor. Using the old tractor, it takes him 5 hours. If his son helped him plow the field, how long will it take them to plow the ricefield using both tractors? \n" ); document.write( "
Algebra.Com's Answer #281059 by Alan3354(69443)\"\" \"About 
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The new tractor does 1/3 of the field per hour.
\n" ); document.write( "The old one does 1/5 per hour.
\n" ); document.write( "Together, the do 1/3 + 1/5 per hour.
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