document.write( "Question 1025164: It took Andy 9 hours to drive to a rock concert. On the way home, he was able to increase his average speed by 14 mph and make the return drive in only 7 hours. What is his average speed for the drive home \n" ); document.write( "

Algebra.Com's Answer #640548 by ikleyn(52790) $\"\"$ $\"About$

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\n" ); document.write( "It took Andy 9 hours to drive to a rock concert. On the way home, he was able to increase his average speed by 14 mph and
\n" ); document.write( "make the return drive in only 7 hours. What is his average speed for the drive home?
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document.write( "Your guiding equation is \r\n" );
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document.write( "9*u = 7*(u+14),\r\n" );
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document.write( "where u is his speed on the way to the rock concert, in mph.  (Each side of the equation is the distance between home and concert).\r\n" );
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document.write( "The solution is u = 49 mph.\r\n" );
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document.write( "So, the speed on the way home is 49+14 = 63 mph.\r\n" );
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