document.write( "Question 616767: Jack usually mows his lawn in 5 hours. Marilyn mows the same size lawn in 3 hours. How long would it take to mow the lawn together? \n" ); document.write( "
Algebra.Com's Answer #387889 by dragonwalker(73)\"\" \"About 
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Find the mean time that it takes to mow the lawn:\r
\n" ); document.write( "\n" ); document.write( "(5 + 3)/2 = 4 hours\r
\n" ); document.write( "\n" ); document.write( "But as there are two people doing it at this mean speed then the actual time would be half this so it would actually take 4/2 = 2 hours
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