document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=181433>Question 181433</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels down the river for 8 miles in 20 minutes.  The same boat travels<BR>\n" );
document.write( "back up the river for 8 miles in 30 minutes.  Find the speed of the boat in <BR>\n" );
document.write( "still water. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #136040 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=136040\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A boat travels down the river for 8 miles in 20 minutes. <BR>\n" );
document.write( "The same boat travels back up the river for 8 miles in 30 minutes. <BR>\n" );
document.write( "Find the speed of the boat in still water.<BR>\n" );
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document.write( "Downriver DATA:<BR>\n" );
document.write( "distance = 8 miles ; time = (1/3)hr. ; rate = d/t = 8/(1/3) = 24 mph<BR>\n" );
document.write( "----------------------------------------------<BR>\n" );
document.write( "Upriver Data:<BR>\n" );
document.write( "distance = 8 miles; time = (1/2) hr ; rate = d/t = 8/(1/2) = 16 mph<BR>\n" );
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document.write( "Equations:<BR>\n" );
document.write( "b + c = 24<BR>\n" );
document.write( "b - c = 16<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "2b = 40<BR>\n" );
document.write( "b = 20 mph (speed of the boat in still water)<BR>\n" );
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document.write( "Substitute to solve for \"c\":<BR>\n" );
document.write( "20 + c = 24<BR>\n" );
document.write( "c = 4 mph (speed of the current)<BR>\n" );
document.write( "=======================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );