document.write( "Question 1071439: Two cars start from towns 420 miles apart and travel toward each other. They meet at 4 HR. Find the speed of each car if one travels 15 mph faster than the other. \n" ); document.write( "

Algebra.Com's Answer #686395 by ikleyn(52776) $\"\"$ $\"About$

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document.write( "Let r be the speed of the faster car, in mph.\r\n" );
document.write( "Then the speed of the slower one is (r-15) mph.\r\n" );
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document.write( "The \"distance\" equation is\r\n" );
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document.write( "4*r + 4*(r-15) = 420.\r\n" );
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document.write( "4r + 4r - 60 = 420,\r\n" );
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document.write( "8r = 420 + 60,\r\n" );
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document.write( "8r = 480  --->  r =  = 60.\r\n" );
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document.write( "Answer.  The speed of the faster car is 60 mph. That of the slower car is 60-15 = 45 mph.\r\n" );
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