document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=11610>Question 11610</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello, Here is the question I need to solve to begin with\r<BR>\n" );
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document.write( "An earthquake emits primary waves moving at 8.0 Km/s and seconday waves moving at 5.0 km/s. How far from the epi-center of the earthquake is the seismic station if the two waves arrive at the station 2.0 min apart.\r<BR>\n" );
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document.write( "What I could figure out (I think)\r<BR>\n" );
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document.write( "I was converting time to seconds\r<BR>\n" );
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document.write( "2 min = 60x2=120 min\r<BR>\n" );
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document.write( "and converting km/s to ft/s\r<BR>\n" );
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document.write( "8.0km/s x 1000 m =8000m<BR>\n" );
document.write( "8000m x 3.281 = 26248 ft/s\r<BR>\n" );
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document.write( "5.0km/s x 1000 m = 5000 m<BR>\n" );
document.write( "5000m x 3.281 ft = 16405 ft/s\r<BR>\n" );
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document.write( "I was also trying calculations with d=rt where d= distance r= stands for rate of speed and t= time.\r<BR>\n" );
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document.write( "Thank you so much to any help or direction you can point me in!\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #5983 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=5983\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> First, I don't see any need to convert Km to feet. Ok to convert 2 minutes to 120 seconds.\r<BR>\n" );
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document.write( "For the primary wave:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d1+=+%28r1%29t1 ALIGN=MIDDLE  ALT=\"d1+=+%28r1%29t1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d1+=+%2880%29t1 ALIGN=MIDDLE  ALT=\"d1+=+%2880%29t1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "For the secondary wave:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d2+=+%28r2%29t2 ALIGN=MIDDLE  ALT=\"d2+=+%28r2%29t2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d2+=+%285%29%28t1%2B120%29 ALIGN=MIDDLE  ALT=\"d2+=+%285%29%28t1%2B120%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "But, d1 = d2, so:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=80t1+=+5%28t1%2B120%29 ALIGN=MIDDLE  ALT=\"80t1+=+5%28t1%2B120%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Simplify and solve for t1.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=80t1+=+5t1+%2B+600 ALIGN=MIDDLE  ALT=\"80t1+=+5t1+%2B+600\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract 5t1 from both sides.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=75t1+=+600 ALIGN=MIDDLE  ALT=\"75t1+=+600\"   DISABLED_style= \"max-width:90%; height:auto;\" > Divide both sides by 75.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t1+=+8 ALIGN=MIDDLE  ALT=\"t1+=+8\"   DISABLED_style= \"max-width:90%; height:auto;\" >seconds.  Substitute this into <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d1+=+80t1 ALIGN=MIDDLE  ALT=\"d1+=+80t1\"   DISABLED_style= \"max-width:90%; height:auto;\" > and solve for d1.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d1+=+80%288%29 ALIGN=MIDDLE  ALT=\"d1+=+80%288%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d1+=+640 ALIGN=MIDDLE  ALT=\"d1+=+640\"   DISABLED_style= \"max-width:90%; height:auto;\" > Km.\r<BR>\n" );
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document.write( "Check:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d2+=+r2%28t1%2B120%29 ALIGN=MIDDLE  ALT=\"d2+=+r2%28t1%2B120%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d2+=+5%288%2B120%29 ALIGN=MIDDLE  ALT=\"d2+=+5%288%2B120%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d2+=+5%28128%29 ALIGN=MIDDLE  ALT=\"d2+=+5%28128%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d2+=+640 ALIGN=MIDDLE  ALT=\"d2+=+640\"   DISABLED_style= \"max-width:90%; height:auto;\" >Km. </SPAN>\n" );
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