document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1183254>Question 1183254</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mr. Trump drove to work in the morning at the average speed of 60 miles per hour. He returned home in the evening along the same route and averaged 45 miles per hour. To the nearest tenth, what is his average speed, in miles per hour, for the entire trip? </SPAN>\n" );
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document.write( "There are in fact many more than two ways to solve a problem like this....<br><BR>\n" );
document.write( "Here is what I would do to solve this, given that the two speeds are \"nice\" numbers.<br><BR>\n" );
document.write( "The distances to and from work are of course the same, and the ratio of the two speeds is 60:45 = 4:3.  That means the ratio of times spent at the two speeds is 3:4.  So 3/7 of the time he drove at 60mph and 4/7 of the time he drove at 45mph.<br><BR>\n" );
document.write( "Since average speed is total distance divided by total time, his average speed in mph was<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%283%2F7%29%2860%29%2B%284%2F7%29%2845%29+=+%283%2A60%2B4%2A45%29%2F7+=+360%2F7 ALIGN=MIDDLE  ALT=\"%283%2F7%29%2860%29%2B%284%2F7%29%2845%29+=+%283%2A60%2B4%2A45%29%2F7+=+360%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "ANSWER: his average speed in mph was 360/7 = 51 3/7 or 51.4, to the nearest tenth.<br><BR>\n" );
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