document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=282205>Question 282205</A>: <I><SPAN STYLE=\"word-break: break-all;\"> BETH WAS REQUIRED TO MAKE A CROSS-COUNTRY FLIGHT IN TRAINING FOR HER PILOT LICENSE . WHEN SHE FLEW FROM HER HOME AIRPORT A STEADY 30 MILES PER HOUR WIND WAS BEHIND HER AND THE TRIP TOOK 5 HOURS. WHEN SHE RETURED AGAINST THE WIND THE FLIGHT TOOK 7 HOURS. FIND THE PLANES SPEED IN STILL AIR AND THE DISTANCE TRAVELED EACH WAY </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #204949 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=204949\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> BETH WAS REQUIRED TO MAKE A CROSS-COUNTRY FLIGHT IN TRAINING FOR HER PILOT LICENSE . WHEN SHE FLEW FROM HER HOME AIRPORT A STEADY 30 MILES PER HOUR WIND WAS BEHIND HER AND THE TRIP TOOK 5 HOURS. WHEN SHE RETURED AGAINST THE WIND THE FLIGHT TOOK 7 HOURS. FIND THE PLANES SPEED IN STILL AIR AND THE DISTANCE TRAVELED EACH WAY<BR>\n" );
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document.write( "Assuming the wind was the same on the way back:<BR>\n" );
document.write( "Her groundspeed going was a + 30 (a = airspeed)<BR>\n" );
document.write( "Returning, it was a - 30<BR>\n" );
document.write( "d = rt<BR>\n" );
document.write( "d = (a+30)*5 = (a-30)*7<BR>\n" );
document.write( "5a + 150 = 7a - 210<BR>\n" );
document.write( "-2a = -360<BR>\n" );
document.write( "a = 180 mph<BR>\n" );
document.write( "d = 5*210 = 1050 miles<BR>\n" );
document.write( "d = 7*150 = 1050 miles<BR>\n" );
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document.write( "Beth would know that there is no \"plane's speed in still air\", <BR>\n" );
document.write( "it's called airspeed.<BR>\n" );
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