document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=81772>Question 81772</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Printing press A can print an order in 7hours. If printing press B is used along with press A, the job can be completed in 5hr. How long would it take printing press B to print the job by itself? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #58601 by </B><A HREF=/tutors/aboutme.mpl?userid=dolly><B>dolly(163)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=dolly><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=58601\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Time taken by press A = 7 hrs.<BR>\n" );
document.write( "So work done in 1 hr = 1/7 part\r<BR>\n" );
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document.write( "Let the time taken by press B = x hrs<BR>\n" );
document.write( "So work done in 1 hr = 1/x part\r<BR>\n" );
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document.write( "Together work done in 1 hr = 1/7 + 1/x\r<BR>\n" );
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document.write( "                           = (x + 7)/7x\r<BR>\n" );
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document.write( "Given they complete in 5 hrs.<BR>\n" );
document.write( "==> they complete 1/5 part in 1 hr\r<BR>\n" );
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document.write( "So (x + 7)/7x = 1/5\r<BR>\n" );
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document.write( "==> 5(x+7) = 7x\r<BR>\n" );
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document.write( "==>  5x + 35 = 7x\r<BR>\n" );
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document.write( "==> 35 = 7x - 5x<BR>\n" );
document.write( "==> 35 = 2x<BR>\n" );
document.write( "==> 35/2 = x<BR>\n" );
document.write( "==> 17.5 = x\r<BR>\n" );
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document.write( "Thus B takes 17.5 hrs to complete all by itself </SPAN>\n" );
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