document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=753996>Question 753996</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A cruise boat travels 84miles  down stream in 4 hours and returns to its starting point upstream in 7 hours. Write a system of equation to find the speed of the boat and the speed of the current ehere b represents the speed of the boat and c represents the sepeed 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 #458736 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=458736\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A cruise boat travels 84miles  down stream in 4 hours and returns to its starting point upstream in 7 hours. Write a system of equation to find the speed of the boat and the speed of the current ehere b represents the speed of the boat and c represents the sepeed of the current. <BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "Speed d/stream = 84/4 = 21 mi/hr<BR>\n" );
document.write( "Speed u/stream = 84/7 = 12 mi/hr<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "The boat's speed is the average of the 2, = (21+12)/2 = 16.5 mi/hr<BR>\n" );
document.write( "b = 16.5 mi/hr<BR>\n" );
document.write( "The current is the difference = 21 - 16.5 = 4.5 mi/hr<BR>\n" );
document.write( "c = 4.5 mi/hr<BR>\n" );
document.write( "=====================<BR>\n" );
document.write( "I don't know how to make it complicated, nor do I see any reason to do so.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );