document.write( "Question 181897: An express train travels 150 km in the same time that a freight train travels 100km. The average speed of the freight train is 20km/h less than that of the express train. Find the speed of each train.
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Algebra.Com's Answer #136530 by stanbon(75887)\"\" \"About 
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An express train travels 150 km in the same time that a freight train travels 100km. The average speed of the freight train is 20km/h less than that of the express train. Find the speed of each train.
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\n" ); document.write( "Express DATA:
\n" ); document.write( "distance = 150 km ; rate = x km/h ; time = d/r = 150/x hrs.
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\n" ); document.write( "Freight DATA:
\n" ); document.write( "distance = 100 km; rate = (x-20) km/h ; time = d/r = 100/(x-20) hrs.
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\n" ); document.write( "Equation:
\n" ); document.write( "time = time
\n" ); document.write( "150/x = 100/(x-20)
\n" ); document.write( "100x = 150(x-20)
\n" ); document.write( "100x = 150x - 3000
\n" ); document.write( "-50x = -3000
\n" ); document.write( "x = 60 km/h (speed of the express train)
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\n" ); document.write( "x-20 = 40 km/h (speed of the freight train)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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