document.write( "Question 757037: A freight train leaves a station travelling a constant speed of 30 miles per hour (mph). A passenger train leaves at the same time and travels at a constant speed of 35 mph. In how many hours will the trains be 15 miles apart? \n" ); document.write( "
Algebra.Com's Answer #460596 by Alan3354(69443)\"\" \"About 
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A freight train leaves a station travelling a constant speed of 30 miles per hour (mph). A passenger train leaves at the same time and travels at a constant speed of 35 mph. In how many hours will the trains be 15 miles apart?
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\n" ); document.write( "They separate at 5 mi/hr (35 - 30)
\n" ); document.write( "15/5 = 3 hours
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