document.write( "Question 549564: lilly and wilma working together can complete a job in 1 and 1/3 hours. if it takes lilly working alone 2 hours less than wilma to do the job, find the time inquired by each woman working alone. \n" ); document.write( "
Algebra.Com's Answer #357858 by josmiceli(19441)\"\" \"About 
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Let \"+t+\" = Wilma's time to do the job working alone
\n" ); document.write( "\"+t+-+2+\" = Lilly's time working alone
\n" ); document.write( "Add their rates of working to get their
\n" ); document.write( "rate working together
\n" ); document.write( "( 1 job / t hrs ) + ( 1 job / t-2 hrs ) = rate working together
\n" ); document.write( "\"+1%2Ft+%2B+1%2F%28t-2%29+=+1%2F%284%2F3%29+\"
\n" ); document.write( "\"+1%2Ft+%2B+1%2F%28t-2%29+=+3%2F4+\"
\n" ); document.write( "Multiply both sides by \"+t%2A%28t-2%29%2A4+\"
\n" ); document.write( "\"+4%2A%28t-2%29+%2B+4t+=+3t%2A%28t-2%29+\"
\n" ); document.write( "\"+4t+-+8+%2B+4t+=+3t%5E2+-+6t+\"
\n" ); document.write( "\"+3t%5E2+-+14t+%2B+8+=+0+\"
\n" ); document.write( "Use quadratic equation to solve
\n" ); document.write( "\"+t+=+%28-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "\"+a+=+3+\"
\n" ); document.write( "\"+b+=+-14+\"
\n" ); document.write( "\"+c+=+8+\"
\n" ); document.write( "\"+t+=+%28-%28-14%29+%2B-+sqrt%28+%28-14%29%5E2+-+4%2A3%2A8+%29%29%2F%282%2A3%29+\"
\n" ); document.write( "\"+t+=+%28+14+%2B-+sqrt%28+196+-+96+%29%29%2F6+\"
\n" ); document.write( "\"+t+=+%28+14+%2B+sqrt%28100%29+%29%2F+6+\"
\n" ); document.write( "\"+t+=+%28+14+%2B+10+%29%2F+6+\"
\n" ); document.write( "\"+t+=+4+\"
\n" ); document.write( "and, also
\n" ); document.write( "\"+t+=+2%2F3+\"
\n" ); document.write( "I can't use \"+2%2F3+\" because I have to subtract \"2\"
\n" ); document.write( "and I can't have negative time
\n" ); document.write( "\"+t+=+4+\"
\n" ); document.write( "\"+t+-+2+=+2+\"
\n" ); document.write( "4 hrs = Wilma's time to do the job working alone
\n" ); document.write( "2 = Lilly's time working alone
\n" ); document.write( "check answers:
\n" ); document.write( "\"+1%2Ft+%2B+1%2F%28t-2%29+=+3%2F4+\"
\n" ); document.write( "\"+1%2F4+%2B+1%2F2+=+3%2F4+\"
\n" ); document.write( "\"+3%2F4+=+3%2F4+\"
\n" ); document.write( "OK
\n" ); document.write( "
\n" );