document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=901126>Question 901126</A>: <I><SPAN STYLE=\"word-break: break-all;\"> an airplane climbed at an average vertical speed of 300 feet per minute and descended immediately at an average speed of 25 miles per hour. The flight was performed in 25 minutes. What altitude did the plane reach? (1 mile= 5,280 ft) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #546543 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=546543\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> an airplane climbed at an average vertical speed of 300 feet per minute and descended immediately at an average speed of 25 miles per hour. The flight was performed in 25 minutes. What altitude did the plane reach?<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "25 mi/hr = 25*22*60/15 ft/min = 2200 ft/sec<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Avg speed of the round trip = 2*300*2200/(300+2200) = 528 ft/min<BR>\n" );
document.write( "RT distance = 25*528 = 13200 feet<BR>\n" );
document.write( "Altitude = 6600 feet<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );