document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=696141>Question 696141</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A fisherman can row a boat 8 km downstream and return in 100 minutes.If the speed of the stream is 2 km per hour.Find the speed of the stream </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #428816 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=428816\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I think this should read:<BR>\n" );
document.write( "\"A fisherman can row a boat 8 km downstream and return in 100 minutes.If the speed of the stream is 2 km per hour.Find the speed of the boat in still water.\"<BR>\n" );
document.write( "Am I right? If so,<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+ ALIGN=MIDDLE  ALT=\"+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the speed of the boat in still water in km/hr<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;\" > = the time to go downstream<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+%2B+2+ ALIGN=MIDDLE  ALT=\"+s+%2B+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = fisherman's speed going down stream in km/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+-+2+ ALIGN=MIDDLE  ALT=\"+s+-+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = fisherman's speed going upstream in km/hr<BR>\n" );
document.write( "Convert <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+100+ ALIGN=MIDDLE  ALT=\"+100+\"   DISABLED_style= \"max-width:90%; height:auto;\" > min to hours<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+100%2F60+=+5%2F3+ ALIGN=MIDDLE  ALT=\"+100%2F60+=+5%2F3+\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs<BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "Equation going downstream:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+%28+s+%2B+2+%29%2At+ ALIGN=MIDDLE  ALT=\"+8+=+%28+s+%2B+2+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation going upstream:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+%28+s+-+2+%29%2A%28+5%2F3+-+t+%29+ ALIGN=MIDDLE  ALT=\"+8+=+%28+s+-+2+%29%2A%28+5%2F3+-+t+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------------------<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+8%2F%28+s+%2B+2+%29+ ALIGN=MIDDLE  ALT=\"+t+=+8%2F%28+s+%2B+2+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Substitute (1) into (2)<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+%28+s+-+2+%29%2A%28+5%2F3+-+8%2F%28+s%2B2+%29+%29+ ALIGN=MIDDLE  ALT=\"+8+=+%28+s+-+2+%29%2A%28+5%2F3+-+8%2F%28+s%2B2+%29+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+%285%2F3%29%2As+-+10%2F3+-+%288s%29+%2F+%28+s%2B2+%29+%2B+16%2F%28+s%2B2+%29+ ALIGN=MIDDLE  ALT=\"+8+=+%285%2F3%29%2As+-+10%2F3+-+%288s%29+%2F+%28+s%2B2+%29+%2B+16%2F%28+s%2B2+%29+\"   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=+3%2A%28s+%2B+2%29+ ALIGN=MIDDLE  ALT=\"+3%2A%28s+%2B+2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+24%2A%28+s%2B2+%29+=+5s%2A%28+s%2B2+%29+-+10%2A%28+s%2B2+%29+-+24s+%2B+48+ ALIGN=MIDDLE  ALT=\"+24%2A%28+s%2B2+%29+=+5s%2A%28+s%2B2+%29+-+10%2A%28+s%2B2+%29+-+24s+%2B+48+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+24s+%2B+48+=+5s%5E2+%2B+10s+-+10s+-+20+-+24s+%2B+48+ ALIGN=MIDDLE  ALT=\"+24s+%2B+48+=+5s%5E2+%2B+10s+-+10s+-+20+-+24s+%2B+48+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+5s%5E2+-+48s+-+20+=+0+ ALIGN=MIDDLE  ALT=\"+5s%5E2+-+48s+-+20+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Use quadratic formula<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+%28-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29+%2F+%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"+s+=+%28-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29+%2F+%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+a+=+5+ ALIGN=MIDDLE  ALT=\"+a+=+5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+b+=+-48+ ALIGN=MIDDLE  ALT=\"+b+=+-48+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+-20+ ALIGN=MIDDLE  ALT=\"+c+=+-20+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+%28-%28-48%29+%2B-+sqrt%28+%28-48%29%5E2+-+4%2A5%2A%28-20%29+%29%29+%2F+%282%2A5%29+ ALIGN=MIDDLE  ALT=\"+s+=+%28-%28-48%29+%2B-+sqrt%28+%28-48%29%5E2+-+4%2A5%2A%28-20%29+%29%29+%2F+%282%2A5%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" >  <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+%28+48+%2B-+sqrt%28+2304+%2B+400+%29%29+%2F+10+ ALIGN=MIDDLE  ALT=\"+s+=+%28+48+%2B-+sqrt%28+2304+%2B+400+%29%29+%2F+10+\"   DISABLED_style= \"max-width:90%; height:auto;\" >  <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+%28+48+%2B-+sqrt%28+2704+%29%29+%2F+10+ ALIGN=MIDDLE  ALT=\"+s+=+%28+48+%2B-+sqrt%28+2704+%29%29+%2F+10+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+%28+48+%2B+52+%29+%2F+10+ ALIGN=MIDDLE  ALT=\"+s+=+%28+48+%2B+52+%29+%2F+10+\"   DISABLED_style= \"max-width:90%; height:auto;\" > ( can't use the negative square root )<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+100%2F10+ ALIGN=MIDDLE  ALT=\"+s+=+100%2F10+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+10+ ALIGN=MIDDLE  ALT=\"+s+=+10+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The speed of the boat in still water is 10 km/hr<BR>\n" );
document.write( "check answer:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+%28+s+%2B+2+%29%2At+ ALIGN=MIDDLE  ALT=\"+8+=+%28+s+%2B+2+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+%28+10+%2B+2+%29%2At+ ALIGN=MIDDLE  ALT=\"+8+=+%28+10+%2B+2+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+12t+ ALIGN=MIDDLE  ALT=\"+8+=+12t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+2%2F3+ ALIGN=MIDDLE  ALT=\"+t+=+2%2F3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+%28+s+-+2+%29%2A%28+5%2F3+-+t+%29+ ALIGN=MIDDLE  ALT=\"+8+=+%28+s+-+2+%29%2A%28+5%2F3+-+t+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+%28+10+-+2+%29%2A%28+5%2F3+-+t+%29+ ALIGN=MIDDLE  ALT=\"+8+=+%28+10+-+2+%29%2A%28+5%2F3+-+t+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8+=+40%2F3+-+8t+ ALIGN=MIDDLE  ALT=\"+8+=+40%2F3+-+8t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8t+=+40%2F3+-+24%2F3+ ALIGN=MIDDLE  ALT=\"+8t+=+40%2F3+-+24%2F3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8t+=+16%2F3+ ALIGN=MIDDLE  ALT=\"+8t+=+16%2F3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+2%2F3+ ALIGN=MIDDLE  ALT=\"+t+=+2%2F3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK\r<BR>\n" );
document.write( "\n" );
document.write( " \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );