document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=250284>Question 250284</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boat travels 210 miles downstream and back. the trip downstream took 10 hours. the trip back took 70 hours. what is the speed of the boat in still water? what is the speed of the current?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #185309 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=185309\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D=RT<BR>\n" );
document.write( "LET B=THE SPEED OF THE BOAT & C=THE SPEED OF THE CURRENT.<BR>\n" );
document.write( "105=(B+C)10<BR>\n" );
document.write( "105=(B-C)70<BR>\n" );
document.write( "10(B+C)=70(B-C)<BR>\n" );
document.write( "10B+10C=70B-70C<BR>\n" );
document.write( "10B-70B=-70C-10C<BR>\n" );
document.write( "-60B=-80C<BR>\n" );
document.write( "B=-80C/-60<BR>\n" );
document.write( "B=1.333C<BR>\n" );
document.write( "105=(1.333C+C)10<BR>\n" );
document.write( "105=2.333C*10<BR>\n" );
document.write( "105=23.33C<BR>\n" );
document.write( "C=105/23.33<BR>\n" );
document.write( "C=4.5 MPH. FOR THE CURRENT.<BR>\n" );
document.write( "1.333*4.5=6 MPH. FOR THE SPEED OF THE BOAT.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "105=(1.333*-4.5-4.5)70<BR>\n" );
document.write( "105=(6-4.5)*70<BR>\n" );
document.write( "105=1.5*70<BR>\n" );
document.write( "105=105\r<BR>\n" );
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