document.write( "Question 105914: a lab is testing two high-speed trains. One train travels 40 km/h faster than the other train. While one travels 70km, the other travels 60 km. Find their speeds.\r
\n" ); document.write( "\n" ); document.write( "Please break it down.. thanks
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Algebra.Com's Answer #77058 by HyperBrain(694)\"\" \"About 
You can put this solution on YOUR website!
\"speed=distance%2Ftime\"
\n" ); document.write( "\"distance=speed%2Atime\"
\n" ); document.write( "\"time=distance%2Fspeed\"\r
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\n" ); document.write( "\n" ); document.write( "Let x= speed of the slower train
\n" ); document.write( "____x+40=speed of the faster.\r
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\n" ); document.write( "\n" ); document.write( "It took the same time for the faster one to reach 70 km and the slower one to attain 60km.\r
\n" ); document.write( "\n" ); document.write( "time for the slower=\"60%2Fx\"\r
\n" ); document.write( "\n" ); document.write( "time for the faster=\"70%2F%28x%2B40%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"60%2Fx=70%2F%28x%2B40%29\"\r
\n" ); document.write( "\n" ); document.write( "By cross multiplication,\r
\n" ); document.write( "\n" ); document.write( "\"60%28x%2B40%29=70x\"
\n" ); document.write( "\"60x%2B2400=70x\"
\n" ); document.write( "\"70x=60x%2B2400\"
\n" ); document.write( "\"70x-60x=60x-60x%2B2400\"
\n" ); document.write( "\"10x=2400\"
\n" ); document.write( "\"x=240\"
\n" ); document.write( "\"x%2B40=240\"\r
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\n" ); document.write( "\n" ); document.write( "Therefore, their soeeds are 200 and 240 km/hr!\r
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\n" ); document.write( "\n" ); document.write( "Power up,
\n" ); document.write( "HyperBrain!
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