document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1132034>Question 1132034</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An airplane travels west at 180 km/h, and returns east with the jet stream at 300 km/h. What was the average speed in km/h for the whole trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #748858 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=748858\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An airplane travels west at 180 km/h, and returns east with the jet stream at 300 km/h. What was the average speed in km/h for the whole trip?<BR>\n" );
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document.write( "If the distances are the same,<BR>\n" );
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document.write( "The avg is 2*180*300/(180+300)<BR>\n" );
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document.write( "If the distances are not the same, more info is needed.<BR>\n" );
document.write( "Another example of a poorly posed problem.<BR>\n" );
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document.write( "PS  Airplanes do not use km/hr, they use knots.<BR>\n" );
document.write( "1 knot is 1 nautical mile per hour.<BR>\n" );
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document.write( "Also, all communications between aircraft and ATC, towers and ground control can be done in English, anywhere in the world.<BR>\n" );
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