document.write( "Question 1151457: The average speed of an airplane is four times as fast as the average speed of a passenger train. To travel 1440 km, the train requires 12h more than the airplane. Determine the average speeds of the train and the airplane.
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Algebra.Com's Answer #773199 by josgarithmetic(39620) $\"\"$ $\"About$

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document.write( "                  SPEED      TIME            DISTANCE\r\n" );
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document.write( "AIRPLANE            4r        1440/(4r)         1440\r\n" );
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document.write( "TRAIN               r         1440/r            1440\r\n" );
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document.write( "Difference                     12\r\n" );
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\n" ); document.write( " $\"highlight_green%281440%2Fr-1440%2F%284r%29=12%29\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"1440%2Fr-360%2Fr=12\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"1080%2Fr=12\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"r=1080%2F12\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"r=90\"$ -----------the train\r
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