SOLUTION: Please help me solve this problem. An express train travels 150 km. in the same time that a freight train travels 100 km. If the express train goes 20 km. per hour faster than the

Question 388881: Please help me solve this problem.
An express train travels 150 km. in the same time that a freight train travels 100 km. If the express train goes 20 km. per hour faster than the freight train, find the rate of each.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
An express train travels 150 km. in the same time that a freight train travels 100 km. If the express train goes 20 km. per hour faster than the freight train, find the rate of each.
...
freight train speed = xkm/h
express train = x+20 km/h
...
freight train d= 100 km
express train d= 150 km
..
time freight = time express
t=d/r
..
100/x= 150/(x+20)
cross multiply
100(x+20)=150x
100x+2000=150x
2000=150x-100x
2000=50x
/50
2000/50 = x
40 = x freight train speed
..
express train speed = x+20 =40+20 =60 km/h
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