document.write( "Question 1147720: Boris drove to the mountains last weekend and there was heavy traffic there. Trip took 9 hours. When Boris drove home there was no traffic and it took 4 hours. His average rate was 40 mph hiw far is the mountains to his home \n" ); document.write( "

Algebra.Com's Answer #769074 by ikleyn(52798) $\"\"$ $\"About$

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document.write( "Let \"d\" be one way distance, in miles.\r\n" );
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document.write( "Then the total distance was 2d, while the total time was 9+4 = 13 hours.\r\n" );
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document.write( "The average rate of 40 mph is the total distance 2d divided by the total time 13 hours.\r\n" );
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document.write( "Therefore, your equation is\r\n" );
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document.write( "    40 = .\r\n" );
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document.write( "From the equation,  \r\n" );
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document.write( "    2d = 40*13,\r\n" );
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document.write( "     d =  = 20*13 = 260 miles.\r\n" );
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document.write( "ANSWER.  One way distance is 260 miles long.\r\n" );
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