document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=665713>Question 665713</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A motorist travels from Town A to Town B which are 75km apart at an average speed of x kph.If he increases his average speed by 10kph,he would have reached Town B by 15 minutes earlier.Find the Value of x </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #414043 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=414043\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> speed	x					<BR>\n" );
document.write( "speed	x	+	10			<BR>\n" );
document.write( "						<BR>\n" );
document.write( "Distance = same		75	km   		<BR>\n" );
document.write( "original time – time with increased speed =0.25	hour<BR>\n" );
document.write( "t=d/t						<BR>\n" );
document.write( "75/x-75/(x+10)=	0.25					<BR>\n" );
document.write( "LCD=	x	(	x	+	10	)											<BR>\n" );
document.write( "multiply by LCD																	<BR>\n" );
document.write( "75(x+10)-75x=0.25x(x+10)	<BR>\n" );
document.write( "75x+750	-75x=0.25X^2+2.5x					<BR>\n" );
document.write( "750=0.25X^2+2.5x											<BR>\n" );
document.write( "0.25X^2	+2.5x-750	=0								<BR>\n" );
document.write( "Find roots of the quadratic equation																	<BR>\n" );
document.write( "a=	0.25		b=	2.5		c=	-750										<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "x1=(-2.5+sqrt(6.25-750))/0.5						<BR>\n" );
document.write( "x1=(	-2.5	+	27.5	)/	0.5												<BR>\n" );
document.write( "x1=	50																<BR>\n" );
document.write( "																	<BR>\n" );
document.write( "x2=(-7-sqrt(49-20)/2						<BR>\n" );
document.write( "x2=(	-2.5	-	27.5	)/	0.5												<BR>\n" );
document.write( "x2=	-60																<BR>\n" );
document.write( "Speed cannot be negative. \r<BR>\n" );
document.write( "\n" );
document.write( "x= 50 km/h\r<BR>\n" );
document.write( "\n" );
document.write( "m.ananth@hotmail.ca 																	<BR>\n" );
document.write( "													<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );