SOLUTION: An express and local train leave Gray's Lake at 3PM and head for Chicago 50 miles away. The express travels twice as fast as the local and arrive 1 hour ahead of it. Find the spe
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Question 149208: An express and local train leave Gray's Lake at 3PM and head for Chicago 50 miles away. The express travels twice as fast as the local and arrive 1 hour ahead of it. Find the speed of each train.
Answer by mangopeeler07(462) (Show Source): You can put this solution on YOUR website!
2x=express speed
x=local speed
50=miles
50/2x=(50/x)-1
Common denominator=2x
50/2x=100/2x-2x/2x
Eliminate the denominator
50=100-2x
Subtract 100 from both sides
-50=-2x
Divide by -2
25=x
2x=express speed
x=local speed
Local train: 25mph
Express train: 50mph
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