document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=870282>Question 870282</A>: <I><SPAN STYLE=\"word-break: break-all;\"> &#913; Boy covered 31 km in 4 hours<BR>\n" );
document.write( "He cycled part of the way at 14km/h and walked the rest of the way at 4km/h <BR>\n" );
document.write( "How far did he walk? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #524781 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=524781\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Boy covered 31 km in 4 hours<BR>\n" );
document.write( "He cycled part of the way at 14km/h and walked the rest of the way at 4km/h <BR>\n" );
document.write( "How far did he walk?\r<BR>\n" );
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document.write( "let him walk x km<BR>\n" );
document.write( "speed =4 km/h<BR>\n" );
document.write( "t=x/4\r<BR>\n" );
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document.write( "he will cycle 31-x<BR>\n" );
document.write( "speed =14km/h<BR>\n" );
document.write( "t=(31-x)/14\r<BR>\n" );
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document.write( "cycle time + walking time = 4\r<BR>\n" );
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document.write( "x/4 + (31-x)/14 =4\r<BR>\n" );
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document.write( "Multiply by LCM 28<BR>\n" );
document.write( "7x+2(31-x)=4*28<BR>\n" );
document.write( "7x+62-2x=112<BR>\n" );
document.write( "5x=112-62<BR>\n" );
document.write( "5x=50<BR>\n" );
document.write( "x=10 km<BR>\n" );
document.write( "he walks 10 km\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );