SOLUTION: A freight train and an express train leave towns 390km apart, traveling toward one another. The freight train travels 30km per hr slower than the express train. They pass one anoth
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Question 163720: A freight train and an express train leave towns 390km apart, traveling toward one another. The freight train travels 30km per hr slower than the express train. They pass one another 3hr later. What are their speeds?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
390=3x+3(x+30)
390=3x+3x+90
6x=390-90
6x=300
x=300/6
x=50 kmh. is the speed of the freight train.
50+30=80 kmh. for the speed of the express train.
Proof:
390=3*50+3*80
390=150+240
390=390
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