document.write( "Question 1053702: Two trains leave a station at the same time but travel in opposite directions. One moves at a constant speed of 140 km/h while the other rolls along at a speed of 120 km/h. How long does it take for the distance between the trains to reach 390 km? \n" ); document.write( "
Algebra.Com's Answer #668906 by ikleyn(52776)\"\" \"About 
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\n" ); document.write( "\"390%2F%28140%2B120%29\" = \"390%2F260\" = \"3%2F2\" hour = 1 hour and 30 minutes.\r
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\n" ); document.write( "\n" ); document.write( "The sum (140+120) in the denominator is the rate of increasing the distance between the trains (in km/h).\r
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