document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=801743>Question 801743</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A helicopter flies 172 miles against the wind in 2 hours. With the wind it can fly 258 miles in the same amount of time. Find the speed of the helicopter in still air. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #483625 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=483625\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A helicopter flies 172 miles against the wind in 2 hours. With the wind it can fly 258 miles in the same amount of time. Find the speed of the helicopter in still air.<BR>\n" );
document.write( "***<BR>\n" );
document.write( "let x=speed of helicopter in still air<BR>\n" );
document.write( "let c=speed of wind<BR>\n" );
document.write( "x+c=speed of helicopter with the wind<BR>\n" );
document.write( "x-c=speed of helicopter against the wind<BR>\n" );
document.write( "distance = speed *travel time<BR>\n" );
document.write( "..<BR>\n" );
document.write( "in 1 hr, helicopter travels 172/2=86 miles against the wind<BR>\n" );
document.write( "in 1 hr, helicopter travels 258/2=129 miles with the wind<BR>\n" );
document.write( "..<BR>\n" );
document.write( "86=(x-c)(1)<BR>\n" );
document.write( "129=(x+c)(1)<BR>\n" );
document.write( "add<BR>\n" );
document.write( "2x=215<BR>\n" );
document.write( "x=107.5 mph<BR>\n" );
document.write( "speed of helicopter in still air=107.5 mph\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );