document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=631659>Question 631659</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A motorboat can maintain a constant speed of 16 mph relative to the water. The boat makes a trip upstream to a marina in 20 minutes. The return trip takes 15 minutes. 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 #397730 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=397730\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let current speed = x mph\r<BR>\n" );
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document.write( "upstream speed = 16-x mph<BR>\n" );
document.write( "downstream speed= 16+x mph\r<BR>\n" );
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document.write( "Time upstream = 1/3 hours<BR>\n" );
document.write( "Time downstream = 1/4 hours\r<BR>\n" );
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document.write( "Distance upstream = distance downstream\r<BR>\n" );
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document.write( "distance = speed * time\r<BR>\n" );
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document.write( "1/3(16-x) = 1/4(16+x)\r<BR>\n" );
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document.write( "multiply equation by LCD 12<BR>\n" );
document.write( "4(16-x)=3(16+x)<BR>\n" );
document.write( "64-4x = 48+3x<BR>\n" );
document.write( "64-48= 7x<BR>\n" );
document.write( "16=7x<BR>\n" );
document.write( "x= 16/7\r<BR>\n" );
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document.write( "x= 2.3 mph the current speed </SPAN>\n" );
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