document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=115228>Question 115228</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels 24 mi upstream in 3 hrs. then it takes 3 hrs to go downstream at 36 mi downstream, Find the speed of boat in still water and the speed of the current. (using two unknowns, write two equations and solve.)\r<BR>\n" );
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document.write( ">>>>>>>>>>>>>THANKS IN ADVANCE </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #83890 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=83890\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A boat travels 24 mi upstream in 3 hrs. then it takes 3 hrs to go downstream at 36 mi downstream, Find the speed of boat in still water and the speed of the current. (using two unknowns, write two equations and solve.) <BR>\n" );
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document.write( "Let still water speed be \"b\"; Let current speed be \"c\"<BR>\n" );
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document.write( "Upstream DATA:<BR>\n" );
document.write( "Distance = 24 miles ; Time = 3 hrs ; Rate = b-c=d/t = 8 mph<BR>\n" );
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document.write( "Downstream DATA:<BR>\n" );
document.write( "Distance = 36 miles ; Time = 3 hrs ; Rate = b+c=d/t = 12 mph<BR>\n" );
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document.write( "EQUATIONS:<BR>\n" );
document.write( "b+c=12<BR>\n" );
document.write( "b-c=8<BR>\n" );
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document.write( "Add to get:<BR>\n" );
document.write( "2b = 20<BR>\n" );
document.write( "b = 10 mph (boat speed in still water)<BR>\n" );
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document.write( "Substitute to solve for \"c\":<BR>\n" );
document.write( "10+c = 12<BR>\n" );
document.write( "c = 2 mph (current speed)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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