document.write( "Question 991320: Two trains leave the station at the same time. One is traveling to the north at 50 km/hr and the other to the south at 70 km/hr. In how many hours will they be 280 km apart? \n" ); document.write( "
Algebra.Com's Answer #611230 by Alan3354(69443)\"\" \"About 
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Two trains leave the station at the same time. One is traveling to the north at 50 km/hr and the other to the south at 70 km/hr. In how many hours will they be 280 km apart?
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\n" ); document.write( "going in opposite directions --> the speeds are added.
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\n" ); document.write( "d = r*t
\n" ); document.write( "t = d/r
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