document.write( "Question 57977: 90. Avoiding a collision. A car is traveling on a road that is perpendicular to a railroad track. When the car is 30 meters from the crossing, the car’s new collision detector warns the driver that there is a train 50 meters from the car heading toward the same crossing. How far is the train from the crossing \n" );
document.write( "Ans: \/50^2-30^2 \n" );
document.write( "=\/2500-900 \n" );
document.write( "=\/1600 \n" );
document.write( "=40 meters \n" );
document.write( "
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