document.write( "Question 923904: [A freight train leaves town at 40 mph. A second train leaves town 3 hours later at 56 mph. How many hours after the first train leaves will the second overtake the first train?] \n" ); document.write( "
Algebra.Com's Answer #560436 by TimothyLamb(4379)\"\" \"About 
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s = d/t
\n" ); document.write( "d = st
\n" ); document.write( "t = d/s
\n" ); document.write( "---
\n" ); document.write( "distance between trains when 2nd train leaves station:
\n" ); document.write( "d = st
\n" ); document.write( "d = 40*3
\n" ); document.write( "d = 120 miles
\n" ); document.write( "---
\n" ); document.write( "speed of 2nd train relative to 1st train:
\n" ); document.write( "s = 56 - 40
\n" ); document.write( "s = 16 mph
\n" ); document.write( "---
\n" ); document.write( "time for trains to meet:
\n" ); document.write( "t = d/s
\n" ); document.write( "t = 120/16
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "t = 7.5 hours
\n" ); document.write( "---
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