document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=967578>Question 967578</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An hourglass consists of two sets of congruent composite figures on either end. Each composite figure is made up of a cone and a cylinder:\r<BR>\n" );
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document.write( "--Hourglass with sand measuring 47 millimeters high<BR>\n" );
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document.write( "Each cone of the hourglass has a height of 12 millimeters. The total height of the sand within the top portion of the hourglass is 47 millimeters. The radius of both the cylinder and cone is 4 millimeters. Sand drips from the top of the hourglass to the bottom at a rate of 10&#960; cubic millimeters per second. How many seconds will it take until all of the sand has dripped to the bottom of the hourglass?\r<BR>\n" );
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document.write( "A. 6.4<BR>\n" );
document.write( "B. 62.4<BR>\n" );
document.write( "C. 8.5<BR>\n" );
document.write( "D. 56.0\r<BR>\n" );
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document.write( "i think its B??<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 #591426 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=591426\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> i believe you are correct.\r<BR>\n" );
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document.write( "the volume of a cylinder is pi * r^2 * h\r<BR>\n" );
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document.write( "the volume of a cone is 1/3 * pi * r^2 * h\r<BR>\n" );
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document.write( "the total height is 47.<BR>\n" );
document.write( "the height of the cone is 12.<BR>\n" );
document.write( "the height of the cylinder must be 35.\r<BR>\n" );
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document.write( "if the top half is filled with sand, then the volume of the sand is pi * 4^2 * 36 and the volume of the cone is 1/3 * pi * 4^2 * 12.\r<BR>\n" );
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document.write( "the total volume is 1960.353816 cubic millimeters.\r<BR>\n" );
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document.write( "since the top drains at the rate of 10 * pi cubic millimeters per second, the top will be empty and the bottom full after 1960.353816 / (10 * pi) = 62.4 seconds.\r<BR>\n" );
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document.write( "that's my take as well.<BR>\n" );
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