SOLUTION: On Tuesday the express train made the trip in 12 hours. On Wednesday the freight train made the trip in 16 hours. Find the rate of each train if the freight train was 15 miles per

Question 749525: On Tuesday the express train made the trip in 12 hours. On Wednesday the freight train made the trip in 16 hours. Find the rate of each train if the freight train was 15 miles per hour slower than the express train.
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
On Tuesday the express train made the trip in 12 hours. On Wednesday the freight train made the trip in 16 hours. Find the rate of each train if the freight train was 15 miles per hour slower than the express train.
***
let x=distance traveled
rate=distance/travel time
x/12=rate of express train
x/16=rate of freight train
..
x/12-x/16=15
LCD=12*16=192
16x-12x=2880
4x=2880
x=720
x/12=60
x/16=45
rate of express train=60 mph
rate of freight train=45 mph
..
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