document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=550591>Question 550591</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels  60 miles downstream in The same time it takes to go 36 miles upstream. The speed of The boat in still water is 15 mph greater than The speed of The current. Find 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 #358902 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=358902\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A boat travels  60 miles downstream in The same time it takes to go 36 miles upstream.<BR>\n" );
document.write( " The speed of The boat in still water is 15 mph greater than The speed of The current.<BR>\n" );
document.write( " Find The speed of The current.<BR>\n" );
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document.write( "Let x = speed of the current<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(x+15) = speed of the boat in still water<BR>\n" );
document.write( "then<BR>\n" );
document.write( "x + (x+15) = 2x+15; the effective speed down stream<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(x+15) - x = 15 mph; the effective speed upstreams\r<BR>\n" );
document.write( "\n" );
document.write( ":<BR>\n" );
document.write( "Write a time equation; time = dist/speed<BR>\n" );
document.write( ":<BR>\n" );
document.write( "downstr time = upstr time<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60%2F%28%282s%2B15%29%29 ALIGN=MIDDLE  ALT=\"60%2F%28%282s%2B15%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=36%2F15 ALIGN=MIDDLE  ALT=\"36%2F15\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Cross multiply<BR>\n" );
document.write( "36(2s+15) = 60 * 15<BR>\n" );
document.write( "72s + 540 = 900<BR>\n" );
document.write( "72s = 900 - 540<BR>\n" );
document.write( "72s = 360<BR>\n" );
document.write( "s = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=360%2F72 ALIGN=MIDDLE  ALT=\"360%2F72\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "s = 5 mph is the rate of the current<BR>\n" );
document.write( ":<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Confirm this solution,<BR>\n" );
document.write( "The speed of the boat in still water = 15 + 5 = 20 mph<BR>\n" );
document.write( "The speed with the current: 20 + 5 = 25 mph<BR>\n" );
document.write( "The speed against the current: 20 - 5 = 15 mph<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Find the time each way, they should be equal<BR>\n" );
document.write( "60/25 = 2.4 hrs<BR>\n" );
document.write( "36/15 = 2.4 </SPAN>\n" );
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