document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=940246>Question 940246</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An aircraft travels upwind with a speed of 420 mph for 7 hours. In how muchtime will it cover the same distance in absence of wind? Wind speed is 120 mph. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #573040 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=573040\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An aircraft travels upwind with a speed of 420 mph for 7 hours. In how muchtime will it cover the same distance in absence of wind? Wind speed is 120 mph.<BR>\n" );
document.write( "***<BR>\n" );
document.write( "let x=speed of plane with no wind<BR>\n" );
document.write( "let t=travel time of plane with no wind<BR>\n" );
document.write( "x-120=speed of plane against the wind<BR>\n" );
document.write( "travel time*speed=distance<BR>\n" );
document.write( "7*420=2940 miles<BR>\n" );
document.write( "..<BR>\n" );
document.write( "7(x-120)=2940<BR>\n" );
document.write( "7x-840=2940<BR>\n" );
document.write( "7x=3780<BR>\n" );
document.write( "x=540 mph(speed of plane in absence of wind)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "travel time=distance/speed<BR>\n" );
document.write( "t=2940/540<BR>\n" );
document.write( "t=5.44<BR>\n" );
document.write( "travel time of plane in absence of wind=5.44 hrs  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );