document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=766905>Question 766905</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Meg rowed her boat upstream a distance of 91 mi and then rowed back to the starting point. The total time of the trip was 20 hours. If the rate of the current was 3 mph, find the average speed of the boat relative to the water. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #467341 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=467341\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> boat   	speed	x   	mph														<BR>\n" );
document.write( "current     	speed	3	mph														<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "against	current     	x-	3	mph													<BR>\n" );
document.write( "with	current     	x+	3	mph													<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Distance=	91	miles															<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Time against + time with  =			20	hours													<BR>\n" );
document.write( "t=d/r																	<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "91	/(	x   	+	3	)	+	91	/(x	-	3	)	=	20				<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "LCD =	(x	-	3	)	(	x   	+	3	)								<BR>\n" );
document.write( "91	*(	x   	-	3	)	+	91	(x	+	3	)	=	20	(x^2	-	9	)<BR>\n" );
document.write( "91	x   	-	-273	+	91	x   	+	273		=	20	(	x ^2		-	9	)<BR>\n" );
document.write( "182	x   	=	20	x ^2		-180											<BR>\n" );
document.write( "20	x ^2	-	-182	x   	-	180											<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "Find the roots of the equation by quadratic formula																	<BR>\n" );
document.write( "			iiiii														<BR>\n" );
document.write( "a=	20	,	b=	-182	,	c=	-180										<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "b^2-4ac=	33124	+	14400														<BR>\n" );
document.write( "b^2-4ac=	47524																<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%09sqrt%28%0947524%09%29=%09218%09 ALIGN=MIDDLE  ALT=\"%09sqrt%28%0947524%09%29=%09218%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=(	182	+	218	)/	40												<BR>\n" );
document.write( "x1=	10.00																<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=(	182	-218	) /	40													<BR>\n" );
document.write( "x2=	-0.90																<BR>\n" );
document.write( "Ignore negative value																	<BR>\n" );
document.write( "boat   	speed	10	mph														<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "m.ananth@hotmail.ca																	<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );