document.write( "Question 1121630: One morning, Justin drove 5 hours before stopping to eat lunch at Chick-fil-A. After lunch, he increased his speed by 10 mph. If he completed a 450-mile trip in 10 hours of driving time, how fast did he drive in the morning?
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Algebra.Com's Answer #737582 by ikleyn(52787) $\"\"$ $\"About$

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document.write( "Let x = \"how fast did he drive in the morning\".\r\n" );
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document.write( "Then his speed after lunch was (x+10) mph.\r\n" );
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document.write( "The equation is\r\n" );
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document.write( "5x + (10-5)*(x+10) = 450  miles.\r\n" );
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document.write( "5x + 5*(x+10) = 450\r\n" );
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document.write( "5x + 5x + 50 = 450\r\n" );
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document.write( "10x = 450-50 = 400   ====>  x =  = 40 miles per hour was his speed in the morning.\r\n" );
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\n" ); document.write( "\n" ); document.write( "See introductory lessons on Travel and Distance problems\r
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\n" ); document.write( "\n" ); document.write( "You will find the solutions of many similar problems there.\r
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\n" ); document.write( "\n" ); document.write( "Read them and learn once for all from these lessons on how to solve simple Travel and Distance problems.\r
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