document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=803333>Question 803333</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boat travels 1 km upstream and 1 km back. The time for the round trip is 5 hrs. the speed of the stream is 4 km/hr. what is the speed of the boat in still water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #484293 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=484293\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> boat   	speed	x   	kph														<BR>\n" );
document.write( "current     	speed	4	kph														<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "against	current     	x-	4	kph													<BR>\n" );
document.write( "with	current     	x+	4	kph													<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Distance=	1	miles															<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Time against + time with  =			5	hours													<BR>\n" );
document.write( "t=d/r																	<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "1	/(	x   	+	4	)	+	1	/(x	-	4	)	=	5				<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "LCD =	(x	-	4	)	(	x   	+	4	)								<BR>\n" );
document.write( "1	*(	x   	-	4	)	+	1	(x	+	4	)	=	5	(x^2	-	16	)<BR>\n" );
document.write( "1	x   	-	-4	+	1	x   	+	4		=	5	(	x ^2		-	16	)<BR>\n" );
document.write( "2	x   	=	5	x ^2		-80											<BR>\n" );
document.write( "5	x ^2	-	-2	x   	-	80											<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Find the roots of the equation by quadratic formula																<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "a=	5	,	b=	-2	,	c=	-80										<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "b^2-4ac=	4	+	1600														<BR>\n" );
document.write( "b^2-4ac=	1604																<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%09sqrt%28%091604%09%29=%0940.05%09 ALIGN=MIDDLE  ALT=\"%09sqrt%28%091604%09%29=%0940.05%09\"   DISABLED_style= \"max-width:90%; height:auto;\" >												<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29 ALIGN=MIDDLE  ALT=\"x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >																	<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29 ALIGN=MIDDLE  ALT=\"x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >																	<BR>\n" );
document.write( "x1=(	2	+	40.05	)/	10												<BR>\n" );
document.write( "x1=	4.20																<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x2=%28-b-sqrt%28b%5E2-4ac%29%29%2F%282a%29 ALIGN=MIDDLE  ALT=\"x2=%28-b-sqrt%28b%5E2-4ac%29%29%2F%282a%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >																	<BR>\n" );
document.write( "x2=(	2	-40.05	) /	10													<BR>\n" );
document.write( "x2=	-3.80																<BR>\n" );
document.write( "Ignore negative value																	<BR>\n" );
document.write( "boat   	speed	4.205	kph														<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "m.ananth@hotmail.ca																	<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );