document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=761779>Question 761779</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A bicylist riding against the wind averages 10 miles per hour in traveling from A to B. When the wind averages 15 miles per hour in returning from A to B, how many miles per hour is his average speed for the round trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #463505 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=463505\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A bicyclist riding against the wind averages 10 miles per hour in<BR>\n" );
document.write( " traveling from A to B. <BR>\n" );
document.write( "With the wind, averages 15 miles per hour in returning from B to A,<BR>\n" );
document.write( " how many miles per hour is his average speed for the round trip?<BR>\n" );
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document.write( "Let a = average speed for the trip<BR>\n" );
document.write( "Let d = the one-way distance<BR>\n" );
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document.write( "Write a time equation: time = dist/speed<BR>\n" );
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document.write( "against time + with time = total time<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F15 ALIGN=MIDDLE  ALT=\"d%2F15\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F10 ALIGN=MIDDLE  ALT=\"d%2F10\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282d%29%2Fa ALIGN=MIDDLE  ALT=\"%282d%29%2Fa\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "multiply by 30a to clear the denominators, results<BR>\n" );
document.write( "2a(d) + 3a(d) = 30(2d)<BR>\n" );
document.write( "2ad + 3ad = 60d<BR>\n" );
document.write( "5ad = 60d<BR>\n" );
document.write( "divide both sides by d<BR>\n" );
document.write( "5a = 60<BR>\n" );
document.write( "a = 60/5<BR>\n" );
document.write( "a = 12 mph is the average speed for the trip<BR>\n" );
document.write( " </SPAN>\n" );
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