document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=317793>Question 317793</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a motorboat can maintain a constant speed of 16 mile per hour relative to the water. the boat makes a trip upstream to a certain point 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 #227556 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=227556\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a motorboat can maintain a constant speed of 16 mile per hour relative to the water. the boat makes a trip upstream to a certain point in 20 minutes; the return trip takes 15 minutes. what is the speed of the current?\r<BR>\n" );
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document.write( "upstream in 20 minutes = 1/3 hours<BR>\n" );
document.write( "Down stream in 15 minutes = 1/4 hours<BR>\n" );
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document.write( "let speed of current = x mph<BR>\n" );
document.write( "upstream speed will be 16-x<BR>\n" );
document.write( "down stream speed will be 16+x<BR>\n" );
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document.write( "distance is same to & fro<BR>\n" );
document.write( "distance= rate * time<BR>\n" );
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document.write( "1/3 * (16-x) = 1/4*(16+x)<BR>\n" );
document.write( "4*(16-x)=3*(16+x)<BR>\n" );
document.write( "64-4x=48+3x<BR>\n" );
document.write( "7x=16<BR>\n" );
document.write( "x=2.28 mph </SPAN>\n" );
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