document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=161667>Question 161667</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A motorboat left a harbor and traveled to an island at an average rate of 15 knots. The average speed on the return trip was 10 knots. If the total trip took 7.5 hours, how far is the harbor from the island? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #119148 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=119148\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D=RT<BR>\n" );
document.write( "T=D/R<BR>\n" );
document.write( "7.5=D/15+D/10<BR>\n" );
document.write( "7.5=(10D+15D)/150<BR>\n" );
document.write( "7.5=25D/150<BR>\n" );
document.write( "25D=7.5*150<BR>\n" );
document.write( "25D=1125<BR>\n" );
document.write( "D=1125/25<BR>\n" );
document.write( "D=45 MILES FROM THE HARBOR TO THE ISLAND.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "7.5=45/15+45/10<BR>\n" );
document.write( "7.5=3+4.5<BR>\n" );
document.write( "7.5=7.5 <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );