document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=470166>Question 470166</A>: <I><SPAN STYLE=\"word-break: break-all;\"> ken makes a 4-mile motorboat trip downstream in 20 minutes ( 1/3 hr). The return trip takes 30 minutes (1/2 hr). Find the rate of the boat in still water and 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 #322577 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=322577\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> ken makes a 4-mile motorboat trip downstream in 20 minutes ( 1/3 hr). The return trip takes 30 minutes (1/2 hr). Find the rate of the boat in still water and the rate of the current<BR>\n" );
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document.write( "4 mi/(1/3) hr = 12 mi/hr<BR>\n" );
document.write( "4 mi/(1/2) hr = 8 mi/hr<BR>\n" );
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document.write( "The boat's speed is the average = (12 + 8)/2 = 10 mph<BR>\n" );
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document.write( "The current is the difference = 12 - 10 = 2 mph\r<BR>\n" );
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