document.write( "Question 1144566: The speed of an express train is x km per hour and the speed of the ordinary train is 40 km per hour less than that of the express train. If the ordinary train takes 2 hours longer that the express train to cover a distance of 480 km, find the speed of the express train.
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Algebra.Com's Answer #765716 by josgarithmetic(39630) $\"\"$ $\"About$

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document.write( "TRAIN            SPEED     TIME          DISTANCE\r\n" );
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document.write( "express           x         480/x           480\r\n" );
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document.write( "ordinary         x-40       480/(x-40)      480\r\n" );
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document.write( "diff                        2\r\n" );
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\n" ); document.write( " $\"480%2F%28x-40%29-480%2Fx=2\"$ \r
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\n" ); document.write( " $\"x%5E2-40x-9600=0\"$ \r
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