document.write( "Question 1154641: An empty freight train traveled 60 miles from an auto assembly plant to an oil refinery. There, its tank cars were filled with petroleum products, and it returned on the same route to the plant. The total travel time for the train was
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Algebra.Com's Answer #777108 by ikleyn(52776) $\"\"$ $\"About$

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document.write( "Let x be the slower speed, in miles per hour.\r\n" );
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document.write( "Then the faster speed is (x+10) mph.\r\n" );
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document.write( "The \"time\" equation is \r\n" );
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document.write( "     +  =    hours.\r\n" );
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document.write( "To solve it, multiply both sides by 2x*(x+10).\r\n" );
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document.write( "Then reduce to the standard form quadratic equation and solve it by any way you want/you like.\r\n" );
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document.write( "ANSWER.  The speeds are 40 mph and 30 mph.    (You may solve it MENTALLY (!) )\r\n" );
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