document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=959269>Question 959269</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A jet plane flying with the wind flew 2200 km in 4 hours. Flying against the wind, the plane could fly only 1820 km in the same amount of time. Find:<BR>\n" );
document.write( "a) The rate of the plane in calm air and,<BR>\n" );
document.write( "b) The rate of the wind <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #586354 by </B><A HREF=/tutors/aboutme.mpl?userid=macston><B>macston(5194)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=macston><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=macston><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=586354\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> R=rate of plane; W=rate of wind<BR>\n" );
document.write( "R+W=2200km/4hrs=550km/hr<BR>\n" );
document.write( "R-W=1820km/4hrs=455 km/hr<BR>\n" );
document.write( "R-W=455km/hr Add W to each side.<BR>\n" );
document.write( "R=455km/hr+W<BR>\n" );
document.write( "R+W=550km/hr Substitute for R.<BR>\n" );
document.write( "455km/hr+W+W=550km/hr Subtract 455km/hr from each side.<BR>\n" );
document.write( "2W=95km/hr Divide each side by 2.<BR>\n" );
document.write( "W=47.5 km/hr ANSWER B): Speed of the wind was 47.5 km/hr.<BR>\n" );
document.write( "R=455km/hr+W=455km/hr+47.5km/hr=502.5km/hr<BR>\n" );
document.write( "ANSWER A): The rate of the plane in calm air was 502.5 km/hr.<BR>\n" );
document.write( "CHECK:<BR>\n" );
document.write( "2200km/(502.5km/hr+47.5km/hr)=1820km/(502.5km/hr-47.5km/hr)<BR>\n" );
document.write( "2200km/(550km/hr)=1820km/(455km/hr)<BR>\n" );
document.write( "4hrs=4hrs<BR>\n" );
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