document.write( "Question 1036256: A train 100 meter long takes 3 second to cross a man walking at the rate of 6km/hr in a direction opposite to that of the train. Find the speed of the train.
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Algebra.Com's Answer #650900 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "A train 100 meter long takes 3 second to cross a man walking at the rate of 6km/hr in a direction opposite to that of the train.
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document.write( "Let \"u\" be the speed of the train (in meters/minute !), now unknown.\r\n" );
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document.write( "Then the equation is\r\n" );
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document.write( "0.05*u + 100*0.05 = 100     (1)\r\n" );
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document.write( "(0.05 is the 0.05 minute =  minute = 3 sec;\r\n" );
document.write( "100  = 6  =  = 100  ).\r\n" );
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document.write( "Simplify and solve (1):\r\n" );
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document.write( "0.05u + 5 = 100,\r\n" );
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document.write( "0.05u = 100 - 5 = 95,\r\n" );
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document.write( "u =  = 1900  = 114 .\r\n" );
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document.write( "Answer.  The speed of the train is 114 .\r\n" );
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Solved.\r
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