document.write( "Question 926787: if a man clear a plot of land at 3 hours, another man clear a plot of land at 5 hours and another man clear a plot of land at 7 hours, how many hours will it take 3 of the men to clear one plot of land \n" ); document.write( "
Algebra.Com's Answer #562543 by TimothyLamb(4379)\"\" \"About 
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r = w/t
\n" ); document.write( "rates are additive:
\n" ); document.write( "1/3 + 1/5 + 1/7 = 0.6761904762
\n" ); document.write( "---
\n" ); document.write( "t = w/r
\n" ); document.write( "---
\n" ); document.write( "t = 1 / 0.6761904762
\n" ); document.write( "t = 1.47887323944 hours
\n" ); document.write( "t = 1 hour 0.47887323944 * 60 minutes
\n" ); document.write( "t = 1 hour 28.7 minutes
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