SOLUTION: the freight train headed south at 9 a.m. and the express train headed north from the same station at noon. at 3 p.m. the trains were 420 miles apart. What was the speed of each i
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Question 817955: the freight train headed south at 9 a.m. and the express train headed north from the same station at noon. at 3 p.m. the trains were 420 miles apart. What was the speed of each if the speed of the express train was 20 miles per hour greater than the speed of the freight train?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
6f+3e=420
e=20+f
6f+3*(20+f)=420
6f+60+3f=420
9f=360
f=40
e=60
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