document.write( "Question 831336: a train is going 100 mph, a car on top of the train
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Algebra.Com's Answer #501246 by Alan3354(69443)\"\" \"About 
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a train is going 100 mph, a car on top of the train
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\n" ); document.write( "If they're going the same direction, the speeds are added.
\n" ); document.write( "If the car is going opposite the train, its speed is subtracted.
\n" ); document.write( "Speeds are assumed to be relative to the Earth.
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