document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=192008>Question 192008</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780073533490/algebrahomeworkh>Elementary and intermediate algebra </A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Junior’s boat will go 15 miles per hour in still water.  If he can go 12 miles downstream in the same amount of time as it takes to go 9miles upstream then what is the speed 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 #144180 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=144180\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Junior’s boat will go 15 miles per hour in still water. If he can go 12 miles<BR>\n" );
document.write( " downstream in the same amount of time as it takes to go 9 miles upstream then <BR>\n" );
document.write( "what is the speed of the current.<BR>\n" );
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document.write( "Let c = speed of the current<BR>\n" );
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document.write( "(15+c) = speed downstream<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(15-c) = speed upstream<BR>\n" );
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document.write( "Write a time equation; Time = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=distance%2Fspeed ALIGN=MIDDLE  ALT=\"distance%2Fspeed\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Time down = time up<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12%2F%28%2815%2Bc%29%29 ALIGN=MIDDLE  ALT=\"12%2F%28%2815%2Bc%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=9%2F%28%2815-c%29%29 ALIGN=MIDDLE  ALT=\"9%2F%28%2815-c%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Cross multiply<BR>\n" );
document.write( "9(15+c) = 12(15-c)<BR>\n" );
document.write( "135 + 9c = 180 - 12c<BR>\n" );
document.write( "9c + 12c = 180 - 135<BR>\n" );
document.write( "21c = 45<BR>\n" );
document.write( "c = 2.143 mph is the speed of the current<BR>\n" );
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document.write( "Check solution by finding the times using a calc:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12%2F%28%2815%2B2.143%29%29 ALIGN=MIDDLE  ALT=\"12%2F%28%2815%2B2.143%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 7.0<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=9%2F%28%2815-2.143%29%29 ALIGN=MIDDLE  ALT=\"9%2F%28%2815-2.143%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 7.0 hrs\r<BR>\n" );
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document.write( " </SPAN>\n" );
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