document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=148676>Question 148676</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane leaves an airport and flies south at 188 mph. Later, a second plane leaves the same airport and flies south at 470mph. If the second plane overtakes the first one in 2.5 hours, how long of a head start did the first plane have?\r<BR>\n" );
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document.write( "a. 2hr b. 3hr c.3.75 hr d. 4.75hr e. 6.25hr\r<BR>\n" );
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document.write( "I just can't figure this out. Please help.  My e-mail address is kslau94828@aol.com<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 #109006 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=109006\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A plane leaves an airport and flies south at 188 mph. Later, a second plane leaves the same airport and flies south at 470mph. If the second plane overtakes the first one in 2.5 hours, how long of a head start did the first plane have? <BR>\n" );
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document.write( "Let t = head start time in hrs<BR>\n" );
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document.write( "When one plane overtakes the other plane. they will have traveled the same distance<BR>\n" );
document.write( "Write a distance equation from this fact: Dist = speed * time<BR>\n" );
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document.write( "2nd plane travel time = 2.5 hrs<BR>\n" );
document.write( "1st plane travel time = (t+2.5)<BR>\n" );
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document.write( "188(t+2.5) = 470 * 2.5<BR>\n" );
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document.write( "188t + 470 = 1175<BR>\n" );
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document.write( "188t = 1175 - 470<BR>\n" );
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document.write( "188t = 705<BR>\n" );
document.write( "t = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=705%2F188 ALIGN=MIDDLE  ALT=\"705%2F188\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t = 3.75 hr head start<BR>\n" );
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document.write( "Check the solution by confirming that each plane traveled the same distance<BR>\n" );
document.write( "1st plane travel time: 2.5 + 3.75 = 6.25<BR>\n" );
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document.write( "188 * 6.25 = 1175 mi<BR>\n" );
document.write( "470 * 2.5  = 1175 mi </SPAN>\n" );
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