document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1064441>Question 1064441</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a motorboat can maintain a constant speed of 35 miles per hour relative to the water. the boat makes a trip upstream to a certain point in 30 minutes; the return trip takes 20 minutes. what is the soeed of the current? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #679494 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=679494\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+35+ ALIGN=MIDDLE  ALT=\"+35+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/hr is the speed without a current<BR>\n" );
document.write( "The 2 trips each have the same distance, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+ ALIGN=MIDDLE  ALT=\"+d+\"   DISABLED_style= \"max-width:90%; height:auto;\" > in miles<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+cv+ ALIGN=MIDDLE  ALT=\"+cv+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the speed of the current in mi/hr<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "Boat going upstream:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+%28+35+-+c+%29%2A%2830%2F60%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+35+-+c+%29%2A%2830%2F60%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Boat going downstream:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+%28+35+%2B+c+%29%2A%2820%2F60%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+35+%2B+c+%29%2A%2820%2F60%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "( note that I converted minutes to hours )<BR>\n" );
document.write( "---------------------------------------<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+%28+35+-+c+%29%2A%281%2F2%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+35+-+c+%29%2A%281%2F2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2d+=+35+-+c+ ALIGN=MIDDLE  ALT=\"+2d+=+35+-+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2d+%2B+c+=+35+ ALIGN=MIDDLE  ALT=\"+2d+%2B+c+=+35+\"   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=+d+=+%28+35+%2B+c+%29%2A%281%2F3%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+35+%2B+c+%29%2A%281%2F3%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=+3d+=+35+%2B+c+ ALIGN=MIDDLE  ALT=\"+3d+=+35+%2B+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3d+-+c+=+35+ ALIGN=MIDDLE  ALT=\"+3d+-+c+=+35+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------------<BR>\n" );
document.write( "Add (1) and (2)<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2d+%2B+c+=+35+ ALIGN=MIDDLE  ALT=\"+2d+%2B+c+=+35+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3d+-+c+=+35+ ALIGN=MIDDLE  ALT=\"+3d+-+c+=+35+\"   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=+5d+=+70+ ALIGN=MIDDLE  ALT=\"+5d+=+70+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+14+ ALIGN=MIDDLE  ALT=\"+d+=+14+\"   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=+2d+%2B+c+=+35+ ALIGN=MIDDLE  ALT=\"+2d+%2B+c+=+35+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2%2A14+%2B+c+=+35+ ALIGN=MIDDLE  ALT=\"+2%2A14+%2B+c+=+35+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+28+%2B+c+=+35+ ALIGN=MIDDLE  ALT=\"+28+%2B+c+=+35+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+7+ ALIGN=MIDDLE  ALT=\"+c+=+7+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The speed of the current is 7 mi/hr<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+%28+35+-+c+%29%2A%281%2F2%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+35+-+c+%29%2A%281%2F2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+14+=+%28+35+-+7+%29%2A%281%2F2%29+ ALIGN=MIDDLE  ALT=\"+14+=+%28+35+-+7+%29%2A%281%2F2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+14+=+28%2F2+ ALIGN=MIDDLE  ALT=\"+14+=+28%2F2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+14+=+14+ ALIGN=MIDDLE  ALT=\"+14+=+14+\"   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=+d+=+%28+35+%2B+c+%29%2A%281%2F3%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+35+%2B+c+%29%2A%281%2F3%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=+14+=+%28+35+%2B+7+%29%2A%281%2F3%29+ ALIGN=MIDDLE  ALT=\"+14+=+%28+35+%2B+7+%29%2A%281%2F3%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=+14+=+42%2F3+ ALIGN=MIDDLE  ALT=\"+14+=+42%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=+14+=+14+ ALIGN=MIDDLE  ALT=\"+14+=+14+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );