document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=868986>Question 868986</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please mail me this answer..asap<BR>\n" );
document.write( "Train A is heading north to south at a speed of 40 miles per hour. Train B is heading south to <BR>\n" );
document.write( "north at a speed of 50 miles per hour. A and B are traveling toward each other on <BR>\n" );
document.write( "neighboring tracks and the distance between them is 180 miles and there are no stations <BR>\n" );
document.write( "between them. A bird is flying back and forth between them at a speed of 55 miles per hour. <BR>\n" );
document.write( "The bird will keep flying until the trains cross each other. What is the distance traveled by the bird before the crossing happens?<BR>\n" );
document.write( "a) 180 miles <BR>\n" );
document.write( "b) 110 miles <BR>\n" );
document.write( "c) 135 miles <BR>\n" );
document.write( "d) 90+ 90/2+90/4+90/6….. miles \r<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 #523977 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=523977\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Train A is heading north to south...<BR>\n" );
document.write( "That's heading south.<BR>\n" );
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document.write( "Going in opposite directions, the speeds are added, often called the \"closing speed.\"<BR>\n" );
document.write( "40 + 50 = 90 mi/hr<BR>\n" );
document.write( "d = r*t<BR>\n" );
document.write( "t = d/r = 2 hours until they meet<BR>\n" );
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document.write( "The bird flies for 2 hours at 55 mi/hr </SPAN>\n" );
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