document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=797197>Question 797197</A>: <I><SPAN STYLE=\"word-break: break-all;\"> hello sir / ma'am, im having trouble with this:\r<BR>\n" );
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document.write( "a boat can travel 8 miles per hour in still water. the boat travels upstream for a certain time in a river whose current flows 2 miles per hour. then, the boat returns to its starting point. if the trip, up and back consumed 8 hours, how long did the boat travel upstream? \r<BR>\n" );
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document.write( "thank you so much! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #481712 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=481712\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a boat can travel 8 miles per hour in still water. the boat travels upstream for a certain time in a river whose current flows 2 miles per hour. then, the boat returns to its starting point. if the trip, up and back consumed 8 hours, how long did the boat travel upstream? <BR>\n" );
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document.write( "Upstream DATA:<BR>\n" );
document.write( "time = t hrs ; rate = 8-2 = 6 mph ; distance = r*t = 6t miles<BR>\n" );
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document.write( "Downstream DATA:<BR>\n" );
document.write( "time = 8-t hrs ; rate = 6+2 = 8 mph ; distance = r*t = 8(8-t) miles<BR>\n" );
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document.write( "Equation:<BR>\n" );
document.write( "distance up = distance down<BR>\n" );
document.write( "6t = 8(8-t)<BR>\n" );
document.write( "6t = 64-8t<BR>\n" );
document.write( "14t = 64<BR>\n" );
document.write( "t = 4.5714 hours (time to travel upstream)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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