Algebra.Com's Answer #844841 by ikleyn(52781)![\"\"](\"/images/stars/stars-13.gif\")  
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document.write( "A train travels a certain journey and is supposed to arrive at midday.
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document.write( "When its average speed is 40km/h, it arrives at 1 p.m.
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document.write( "When its average speed is 48km/h, it arrives at 11 a.m.
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document.write( "What is the length of the journey?
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document.write( "Let \"d\" be the length of the journey.\r\n" );
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document.write( "Then the travel time in the first scenario was  hours.\r\n" );
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document.write( " The travel time in the second scenario was  hours.\r\n" );
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document.write( "The difference between these two travel times was 2 hours (from 11 am to 1 pm).\r\n" );
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document.write( "So, we write this time equation\r\n" );
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document.write( " - = 2 hours.\r\n" );
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document.write( "To solve it, multiply both sides by 240. You will get\r\n" );
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document.write( " 6d - 5d = 2*240\r\n" );
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document.write( " d = 480.\r\n" );
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document.write( "ANSWER. The length of the journey is 480 kilometers.\r\n" );
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document.write( "Solved.\r
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