document.write( "Question 1151413: A freight train travels 60 km. A single locomotive pulls the train for the first half of the trip, then a second locomotive is added, doubling the speed of the train. If the total time for the trip is 54 min, what is the speed of the train with one locomotive. \n" ); document.write( "

Algebra.Com's Answer #773148 by ikleyn(52787) $\"\"$ $\"About$

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document.write( "Let x be the train's speed under the question.\r\n" );
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document.write( "Then the time equation is\r\n" );
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document.write( "     +  = .\r\n" );
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document.write( "Multiply both sides by 60x. you will get\r\n" );
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document.write( "    1800 + 900 = 54x\r\n" );
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document.write( "    2700       = 54x\r\n" );
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document.write( "    x          = 2700/54 = 50.\r\n" );
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document.write( "ANSWER.  50 km/h.\r\n" );
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