document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=524430>Question 524430</A>: <I><SPAN STYLE=\"word-break: break-all;\"> It takes Derek 50 minutes to shovel snow from his driveway. When he works with his brother Ken, it takes only 30 min. How long would it take Ken to do the shoveling himself? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #347743 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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/cgi-bin/show-face.mpl?user=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=347743\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Add their individual rates of working to get<BR>\n" );
document.write( "their rate working together<BR>\n" );
document.write( "In words:<BR>\n" );
document.write( "( 1 driveway/Derek's time ) + ( 1 driveway / Ken's time ) = ( 1 driveway/time working together )<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t ALIGN=MIDDLE  ALT=\"t\"   DISABLED_style= \"max-width:90%; height:auto;\" > = Ken's time to shovel driveway alone<BR>\n" );
document.write( "given:<BR>\n" );
document.write( "Derek's rate = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F50+ ALIGN=MIDDLE  ALT=\"+1%2F50+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "Rate working together = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F30+ ALIGN=MIDDLE  ALT=\"+1%2F30+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F50+%2B+1%2Ft+=+1%2F30+ ALIGN=MIDDLE  ALT=\"+1%2F50+%2B+1%2Ft+=+1%2F30+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+150t+ ALIGN=MIDDLE  ALT=\"+150t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3t+%2B+150+=+5t+ ALIGN=MIDDLE  ALT=\"+3t+%2B+150+=+5t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2t+=+150+ ALIGN=MIDDLE  ALT=\"+2t+=+150+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+75+ ALIGN=MIDDLE  ALT=\"+t+=+75+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "It will take Ken 75 minutes, or 1 hour and 15 min<BR>\n" );
document.write( "to shovel the driveway by himself </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );