document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1163447>Question 1163447</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Debbie rides her bicycle to her friends' house. Debbie rides her bike 4mph when going uphill and 12mph when going downhill. If her total time riding was 1 hour, how far is it to her friends' house? </SPAN>\n" );
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document.write( "Here is a very different way to solve this kind of problem.<br><BR>\n" );
document.write( "The distances both directions are the same; the ratio of the two speeds is 1:3.<br><BR>\n" );
document.write( "That means the ratio of times at the two speeds is 3:1.<br><BR>\n" );
document.write( "Since the total time is 1 hour, that means she spent 3/4 of an hour at the lower speed and 1/4 of an hour at the higher speed.<br><BR>\n" );
document.write( "3/4 of an hour at 4mph means she traveled (3/4)*4 = 3 miles; 1/4 of an hour at 12mph means she traveled (1/4)*12 = 3 miles.<br><BR>\n" );
document.write( "ANSWER: 3 miles to her friend's house.<br><BR>\n" );
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