SOLUTION: How do I put this word problem into a quadratic equation or set it up? An express and local train leave Gray�s Lake at 3 P.M. and head for Chicago 50 miles away. The express tra

Question 149089: How do I put this word problem into a quadratic equation or set it up?
An express and local train leave Gray�s Lake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local, and arrives 1 hour ahead of it. Find the speed of each train.
I know that distance equals rate times time but on all else I am confused to say the least. Any info you can offer will be greatly appreciated.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
an express and local train leave Gray's Lake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local, and arrives 1 hour ahead of it. Find the speed of each train.
:
The time they left is irrelevant to the problem
:
Let s = speed of the local
then
2s = speed of the express
:
Write a time equation: Time =
:
Express time + 1 hr = Local time
+ 1 =
Get rid of the denominators, mult equation by 2s; results:
50 + 2s = 2(50)
2s = 100 - 50
2s = 50
s =
s = 25 mph speed of the local
then
50 mph speed of the express
;
;
Check solution
+ 1 =
1 + 1 = 2
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