document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=805762>Question 805762</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels 2 km upstream and 2 km back. The time for the round trip is 10 hours. The speed of the stream is 3km/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 #485465 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=485465\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> boat   	speed	x   	kph														<BR>\n" );
document.write( "current     	speed	3	kph														<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "against	current     	x-	3	kph													<BR>\n" );
document.write( "with	current     	x+	3	kph													<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Distance=	2	miles															<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Time against + time with  =			10	hours													<BR>\n" );
document.write( "t=d/r																	<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "2	/(	x   	+	3	)	+	2	/(x	-	3	)	=	10				<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "LCD =	(x	-	3	)	(	x   	+	3	)								<BR>\n" );
document.write( "2	*(	x   	-	3	)	+	2	(x	+	3	)	=	10	(x^2	-	9	)<BR>\n" );
document.write( "2	x   	-	-6	+	2	x   	+	6		=	10	(	x ^2		-	9	)<BR>\n" );
document.write( "4	x   	=	10	x ^2		-90											<BR>\n" );
document.write( "10	x ^2	-	-4	x   	-	90	=	0									<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Find the roots of the equation by quadratic formula															5.12		<BR>\n" );
document.write( "			iiiii														<BR>\n" );
document.write( "a=	10	,	b=	-4	,	c=	-90										<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "b^2-4ac=	16	+	3600														<BR>\n" );
document.write( "b^2-4ac=	3616																<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%09sqrt%28%093616%09%29=%0960.13%09 ALIGN=MIDDLE  ALT=\"%09sqrt%28%093616%09%29=%0960.13%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;\" >																	0<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=(	4	+	60.13	)/	20												<BR>\n" );
document.write( "x1=	3.21																<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=(	4	-60.13	) /	20													<BR>\n" );
document.write( "x2=	-2.81																<BR>\n" );
document.write( "Ignore negative value																	<BR>\n" );
document.write( "boat   	speed	3.207	kph														<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );