document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=248519>Question 248519</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me help my son with this word problem ...\r<BR>\n" );
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document.write( "A boat travels 60 km upstream (against the current) in 5 hours. The boat travels the same distance downstream in 3 hours. What is the rate of the boat in still water? What is the rate 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 #181117 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=181117\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A boat travels 60 km upstream (against the current) in 5 hours.<BR>\n" );
document.write( "Upstream DATA:<BR>\n" );
document.write( "distance = 60 km ; time = 5 hrs ; rate = distance/time = 60/5 = 12 mph<BR>\n" );
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document.write( "The boat travels the same distance downstream in 3 hours.<BR>\n" );
document.write( "Downstream DATA:<BR>\n" );
document.write( "distance = 60 km ; time = 3 hrs ; rate = d/t = 60/3 = 20 mph<BR>\n" );
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document.write( "What is the rate of the boat in still water? <BR>\n" );
document.write( "What is the rate of the current?<BR>\n" );
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document.write( "Let the rate of the boat in still water be \"b\"<BR>\n" );
document.write( "Let the rate of the current be \"c\".<BR>\n" );
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document.write( "Equations:<BR>\n" );
document.write( "b + c = 20 mph<BR>\n" );
document.write( "b - c = 12 mph<BR>\n" );
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document.write( "Add the equation and solve for \"b\":<BR>\n" );
document.write( "2b = 32<BR>\n" );
document.write( "b = 16 mph (rate of the boat in still water)<BR>\n" );
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document.write( "Substitute b=16 into b+c = 20 to solve for \"c\":<BR>\n" );
document.write( "16 + c = 20<BR>\n" );
document.write( "c = 4 mph (rate of the current)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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