document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=381937>Question 381937</A>: <I><SPAN STYLE=\"word-break: break-all;\"> i sailed west to hawaii against the wind at a speed 12 knots/hour. when i returned, i sailed the same route with a wind at a speed of 18 knots/hour. what was my average speed for the entire trip?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #271067 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=271067\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> i sailed west to Hawaii against the wind at a speed 12 knots/hour.<BR>\n" );
document.write( " when i returned, i sailed the same route with a wind at a speed of 18 knots/hour.<BR>\n" );
document.write( " what was my average speed for the entire trip? <BR>\n" );
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document.write( "Let a = average speed for the entire trip<BR>\n" );
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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( "to time + return time = total time<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F12 ALIGN=MIDDLE  ALT=\"d%2F12\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F18 ALIGN=MIDDLE  ALT=\"d%2F18\"   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" );
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document.write( "We don't need d, divide thru by d and you have<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F12 ALIGN=MIDDLE  ALT=\"1%2F12\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F18 ALIGN=MIDDLE  ALT=\"1%2F18\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2Fa ALIGN=MIDDLE  ALT=\"2%2Fa\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply by 36a to clear the denominators, results<BR>\n" );
document.write( "3a + 2a = 36(2)<BR>\n" );
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document.write( "5a = 72<BR>\n" );
document.write( "a = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=72%2F5 ALIGN=MIDDLE  ALT=\"72%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a = 14.4 knot/hr is the av for the entire trip </SPAN>\n" );
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