document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=838880>Question 838880</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boy can row a boat at a constant rate of 5 mi/hr in still water, as indicated in the figure. He rows upstream for 23 minutes and then rows downstream, returning to his starting point in another 17 minutes.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #505398 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=505398\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> It looks like you want the speed of the current<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+ ALIGN=MIDDLE  ALT=\"+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the speed of the current and<BR>\n" );
document.write( "the distance he rows<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "Rowing downstream:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+%28+5+%2B+c+%29%2A%28+17%2F60+%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+5+%2B+c+%29%2A%28+17%2F60+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Rowing upstream:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+%28+5+-+c+%29%2A%28+23%2F60+%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+5+-+c+%29%2A%28+23%2F60+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( "Substitute (1) into (2)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=++%28+5+%2B+c+%29%2A%28+17%2F60+%29+=+%28+5+-+c+%29%2A%28+23%2F60+%29+ ALIGN=MIDDLE  ALT=\"++%28+5+%2B+c+%29%2A%28+17%2F60+%29+=+%28+5+-+c+%29%2A%28+23%2F60+%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=+60+ ALIGN=MIDDLE  ALT=\"+60+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=++%28+5+%2B+c+%29%2A17+=+%28+5+-+c+%29%2A23+ ALIGN=MIDDLE  ALT=\"++%28+5+%2B+c+%29%2A17+=+%28+5+-+c+%29%2A23+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+85+%2B+17c+=+115+-+23c+ ALIGN=MIDDLE  ALT=\"+85+%2B+17c+=+115+-+23c+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+40c+=+30+ ALIGN=MIDDLE  ALT=\"+40c+=+30+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+3%2F4+ ALIGN=MIDDLE  ALT=\"+c+=+3%2F4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The speed of the current is 3/4 mi/hr<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+%28+5+%2B+.75+%29%2A%28+17%2F60+%29+%0D%0A%281%29+%7B%7B%7B+d+=+5.75%2A.28333+ ALIGN=MIDDLE  ALT=\"+d+=+%28+5+%2B+.75+%29%2A%28+17%2F60+%29+%0D%0A%281%29+%7B%7B%7B+d+=+5.75%2A.28333+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+1.629+ ALIGN=MIDDLE  ALT=\"+d+=+1.629+\"   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+5+-+.75+%29%2A%28+23%2F60+%29+ ALIGN=MIDDLE  ALT=\"+d+=+%28+5+-+.75+%29%2A%28+23%2F60+%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=+d+=+4.25%2A.38333+ ALIGN=MIDDLE  ALT=\"+d+=+4.25%2A.38333+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+1.629+ ALIGN=MIDDLE  ALT=\"+d+=+1.629+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The one-way distance he rows is 1.629 mi\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );