document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=150819>Question 150819</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The speed of a plane is 120 miles per hour in a calm. With the wind it can cover a certain distance in 4 hours, but against the wind it can cover only 3/5 of that distance in the same time. Find the velocity of the wind. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #110747 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=110747\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The speed of a plane is 120 miles per hour in a calm. With the wind it can cover a certain distance in 4 hours, but against the wind it can cover only 3/5 of that distance in the same time. Find the velocity of the wind.<BR>\n" );
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document.write( "Let x=velocity of the wind<BR>\n" );
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document.write( "distance with wind = 4(120+x)<BR>\n" );
document.write( "distance against the wind = 4(120-x)<BR>\n" );
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document.write( "(3/5)(4)(120+x) = 4(120-x) <BR>\n" );
document.write( "(3/5)(120+x) = (120-x) <BR>\n" );
document.write( "(3)(120+x) = 5(120-x) <BR>\n" );
document.write( "360+3x = 600-5x<BR>\n" );
document.write( "360+8x = 600<BR>\n" );
document.write( "8x = 240<BR>\n" );
document.write( "x = 30 mph\r<BR>\n" );
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