document.write( "Question 1030629: By himself, a person can mow his lawn in 60 minutes. If his daughter helps, they can mow the lawn together in 45 minutes. How long would it take his daughter to mow the lawn by herself? \n" ); document.write( "

Algebra.Com's Answer #645464 by fractalier(6550) $\"\"$ $\"About$

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The normal setup for work problems like this is:
\n" ); document.write( " $\"t%2FA+%2B+t%2FB+=+1\"$ as in 1 task, 1 lawn, 1 job...
\n" ); document.write( "The A and B are the times each person takes alone, the t is how long they work together...thus, plugging in the facts from the problem gives us
\n" ); document.write( " $\"45%2F60+%2B+45%2FB+=+1\"$ or
\n" ); document.write( " $\"3%2F4+%2B+45%2FB+=+1\"$
\n" ); document.write( " $\"45%2FB+=+1%2F4\"$
\n" ); document.write( "and
\n" ); document.write( "B = 180 minutes \n" ); document.write( "

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