document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=258735>Question 258735</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An airplane flew for 8 hours at an air speed of x miles per hour (mph), and for 7 more hours at 325 mph. If the average airspeed for the entire flight was 350 mph, which of the following equations could be used to find x ?\r<BR>\n" );
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document.write( "A. x + 325 = 2(350)<BR>\n" );
document.write( "B. x + 7(325) = 15(350)<BR>\n" );
document.write( "C. 8x – 7(325) = 350<BR>\n" );
document.write( "D. 8x + 7(325) = 2(350)<BR>\n" );
document.write( "E 8x + 7(325) = 15(350)\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 #190435 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=190435\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An airplane flew for 8 hours at an air speed of x miles per hour (mph), and for 7 more hours at 325 mph. If the average airspeed for the entire flight was 350 mph, which of the following equations could be used to find x ?\r<BR>\n" );
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document.write( "general formula is rate * time = distance.\r<BR>\n" );
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document.write( "let r = rate<BR>\n" );
document.write( "let h = time in hours<BR>\n" );
document.write( "let d = distance\r<BR>\n" );
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document.write( "total time it took was 8 + 7 = 15 hours.\r<BR>\n" );
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document.write( "average speed for the whole flight was 350 miles per hour.\r<BR>\n" );
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document.write( "formula for the entire flight becomes:\r<BR>\n" );
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document.write( "350 * 15 = d\r<BR>\n" );
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document.write( "formula for the first leg of the trip is equal to:\r<BR>\n" );
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document.write( "x * 8 = d1 where d1 is the distance flown for the first leg of the trip.\r<BR>\n" );
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document.write( "formula for the second leg of the trip is equal to :\r<BR>\n" );
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document.write( "325 * 7 = d2 where d2 is the distance flown for the second leg of the trip.\r<BR>\n" );
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document.write( "since we know that d1 + d2 = d, then we have a general formula that states\r<BR>\n" );
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document.write( "x * 8 + 325 * 7 = 350 * 15\r<BR>\n" );
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document.write( "that looks very much like selection E which is:\r<BR>\n" );
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document.write( "8x + 7(325) = 15(350)\r<BR>\n" );
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document.write( "your answer is selection E.\r<BR>\n" );
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