SOLUTION: A freight train and a passenger train leave cities 630 miles apart and travel towards each other. The passenger train travels 20 mph faster than the freight train. Find the speed o

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Question 888612: A freight train and a passenger train leave cities 630 miles apart and travel towards each other. The passenger train travels 20 mph faster than the freight train. Find the speed of the passenger train if they meet after 7 hours.
Answer by josgarithmetic(39615) About Me  (Show Source):
You can put this solution on YOUR website!
Their rates are summed because that gives how fast they approach eachother.

r for one rate, r+20 for the other rate.
r%2Br%2B20=2r%2B20.

They meet in 7 hours, having closed 630 miles.
highlight_green%28%282r%2B20%29%2A7=630%29;
Solvable in three steps.