document.write( "Question 97190: Two trains left a station at the same time. One travelled north at a certain speed and th eother travelled south at twice the speed. After 4 hours, the trains were 600 miles apart. How fast was each train moving? \n" ); document.write( "
Algebra.Com's Answer #70995 by ankor@dixie-net.com(22740)\"\" \"About 
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Two trains left a station at the same time. One traveled north at a certain speed and the other traveled south at twice the speed. After 4 hours, the trains were 600 miles apart. How fast was each train moving?
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\n" ); document.write( "Let s = northbound train
\n" ); document.write( "Then
\n" ); document.write( "2s = southbound train
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\n" ); document.write( "Distance = time * speed
\n" ); document.write( "4s + 4(2s) = 600
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\n" ); document.write( "4s + 8s = 600
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\n" ); document.write( "12s = 600
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\n" ); document.write( "s = 600/12
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\n" ); document.write( "s = 50 mph is the northbound train
\n" ); document.write( "Then
\n" ); document.write( "2(50) = 100 mph is the southbound train
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\n" ); document.write( "Check:
\n" ); document.write( "4(50) + 4(100) = 600
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