document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=874687>Question 874687</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A man covers distance of 120 km from town A to Town B at an average speed x km/h. If he increased his average speed by 1 km/h he would saved 30 minutes. What is his average speed? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #527643 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=527643\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> CONDITION________speed________time_______distance<BR>\n" );
document.write( "Did_______________x____________t_________<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=120=xt ALIGN=MIDDLE  ALT=\"120=xt\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "If_______________x+1__________t-1/2______<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=120=%28x%2B2%29%28t-1%2F2%29 ALIGN=MIDDLE  ALT=\"120=%28x%2B2%29%28t-1%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Both x and t can be solved.  See that a substitution will be possible using the \"did\" equation.\r<BR>\n" );
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document.write( "The \"If\" equation,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=xt%2B2t-x%2F2-1=120 ALIGN=MIDDLE  ALT=\"xt%2B2t-x%2F2-1=120\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=xt%2B2t-x%2F2-1=xt ALIGN=MIDDLE  ALT=\"xt%2B2t-x%2F2-1=xt\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2t-x%2F2-1=0 ALIGN=MIDDLE  ALT=\"2t-x%2F2-1=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4t-x-2=0 ALIGN=MIDDLE  ALT=\"4t-x-2=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "Again substitute using <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=120%2Fx ALIGN=MIDDLE  ALT=\"t=120%2Fx\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=480%2Fx-x-2=0 ALIGN=MIDDLE  ALT=\"480%2Fx-x-2=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=480-x%5E2-2x=0 ALIGN=MIDDLE  ALT=\"480-x%5E2-2x=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-x%5E2-2x%2B480=0 ALIGN=MIDDLE  ALT=\"-x%5E2-2x%2B480=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28x%5E2%2B2x-480=0%29 ALIGN=MIDDLE  ALT=\"highlight%28x%5E2%2B2x-480=0%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
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document.write( "Check discriminant.  4+4*480=1924.<BR>\n" );
document.write( "481 is a prime number.<BR>\n" );
document.write( "4(481) is discriminant.<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=%28-2%2Bsqrt%284%2A481%29%29%2F2 ALIGN=MIDDLE  ALT=\"x=%28-2%2Bsqrt%284%2A481%29%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=%28-2%2B2sqrt%28481%29%29%2F2 ALIGN=MIDDLE  ALT=\"x=%28-2%2B2sqrt%28481%29%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28x=-1%2Bsqrt%28481%29%29 ALIGN=MIDDLE  ALT=\"highlight%28x=-1%2Bsqrt%28481%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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