SOLUTION: The speed of an express train is x km per hour and the speed of the ordinary train is 40 km per hour less than that of the express train. If the ordinary train takes 2 hours longer

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: The speed of an express train is x km per hour and the speed of the ordinary train is 40 km per hour less than that of the express train. If the ordinary train takes 2 hours longer      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 1144566: The speed of an express train is x km per hour and the speed of the ordinary train is 40 km per hour less than that of the express train. If the ordinary train takes 2 hours longer that the express train to cover a distance of 480 km, find the speed of the express train.
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
TRAIN            SPEED     TIME          DISTANCE

express           x         480/x           480

ordinary         x-40       480/(x-40)      480

diff                        2

480%2F%28x-40%29-480%2Fx=2
.
.
x%5E2-40x-9600=0
.
.
highlight%28x=120%29