document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=251488>Question 251488</A>: <I><SPAN STYLE=\"word-break: break-all;\"> mr.may traveled from home to New York by a car with 15 mph speed. While he was driving, his girlfriend called him to go back home. He suddenly drove back home with 25 mph speed. If this round-trip took 32 minutes. What is the average speed he drove for the round-trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #183184 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=183184\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mr.may traveled from home to New York by a car with 15 mph speed. While he was driving, his girlfriend called him to go back home. He suddenly drove back home with 25 mph speed. If this round-trip took 32 minutes. What is the average speed he drove for the round-trip?<BR>\n" );
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document.write( "Going DATA:<BR>\n" );
document.write( "rate = 15 mph ; distance = x  miles ; time = x/15 hrs<BR>\n" );
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document.write( "Returning DATA:<BR>\n" );
document.write( "rate = 25 mph ; distance = x miles ; time = x/25 hrs<BR>\n" );
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document.write( "Equation:<BR>\n" );
document.write( "time + time = 32/60 hrs<BR>\n" );
document.write( "x/15 + x/25 = 32/60<BR>\n" );
document.write( "x/15 + x/25 = 16/30<BR>\n" );
document.write( "Multiply thru by 150 to get:<BR>\n" );
document.write( "10x + 6x = 80<BR>\n" );
document.write( "15x = 80<BR>\n" );
document.write( "x = 5 miles\r<BR>\n" );
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document.write( "Average speed = total distance / total time<BR>\n" );
document.write( "Ave speed = 10 miles/(32/60)hr = 600/32 = 18.75 mph<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );