document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=916873>Question 916873</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Abby rows 10km upstream and 10km back in a total time of 3hrs.  The speed of the river is 5km/h.  Find abby's speed 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 #556444 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=556444\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> boat   	speed	x   	mph		Time forward + time return = hours												<BR>\n" );
document.write( "current     	speed	5	mph														<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "against	current     	x-	5	km/h													<BR>\n" );
document.write( "with	current     	x+	5	km/h													<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Distance=	10	miles															<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Time against + time with  =			3	hours													<BR>\n" );
document.write( "t=d/r																	<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "10	/(	x   	+	5	)	+	10	/(x	-	5	)	=	3				<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "LCD =	(x	-	5	)	(	x   	+	5	)								<BR>\n" );
document.write( "10	*(	x   	-	5	)	+	10	(x	+	5	)	=	3	(x^2	-	25	)<BR>\n" );
document.write( "10	x   	-	-50	+	10	x   	+	50		=	3	(	x ^2		-	25	)<BR>\n" );
document.write( "20	x   	=	3	x ^2		-75											<BR>\n" );
document.write( "3	x ^2	-	-20	x   	-	-75	=	0									<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Find the roots of the equation by quadratic formula															5.12		<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "a=	3	,	b=	-20	,	c=	-75										<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "b^2-4ac=	400	+	900														<BR>\n" );
document.write( "b^2-4ac=	1300																<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%09sqrt%28%091300%09%29=%0936.06%09 ALIGN=MIDDLE  ALT=\"%09sqrt%28%091300%09%29=%0936.06%09\"   DISABLED_style= \"max-width:90%; height:auto;\" >							379.94					<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=(	20	+	36.06	)/	6												<BR>\n" );
document.write( "x1=	9.34																<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=(	20	-36.06	) /	6													<BR>\n" );
document.write( "x2=	-2.68																<BR>\n" );
document.write( "Ignore negative value																	<BR>\n" );
document.write( "boat   	speed	9.343	km/h														<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "m.ananth@hotmail.ca																	<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );