document.write( "Question 704397: A train leaves and travels north at 85 km per hour. Another train leaves at the same time and travels S at 55 km per hour. How long will it take before they are 560 km apart? \n" ); document.write( "
Algebra.Com's Answer #434065 by Alan3354(69443)\"\" \"About 
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A train leaves and travels north at 85 km per hour. Another train leaves at the same time and travels S at 55 km per hour. How long will it take before they are 560 km apart?
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\n" ); document.write( "The speeds are added when going in opposite directions.
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\n" ); document.write( "d = r*t
\n" ); document.write( "t = d/r
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