document.write( "Question 177379: Please help. Jack mows a lawn in 4 hours. Mary mows the same lawn in 3 hours. How much time would it take for both of them to mow the yard? Thank you. \n" ); document.write( "

Algebra.Com's Answer #132418 by Mathtut(3670) $\"\"$ $\"About$

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so Jack mows 1/4 of the lawn per hour and Mary mows 1/3 of the lawn per hour
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\n" ); document.write( "together they mow\r
\n" ); document.write( "\n" ); document.write( "((1/4)+(1/3) of the lawn per hour
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\n" ); document.write( "(3/12)+(4/12)=7/12 of the lawn per hour
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\n" ); document.write( "(7/12)t=1(job)
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\n" ); document.write( " $\"highlight%28t=12%2F7%29\"$ hours \n" ); document.write( "

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