Word Problems Involving Quadratic Equations

[Equilibrium]

hey can you help me solve these, I've got 20 problems..and i only need is this
problem so that i have an idea of answering the others

An engineer can decrease by 2 hours the time it takes to travel 200km. If he increases the speed of the freight train by 5km per hour, what is the original speed of the train?

 

[Fermat]

Let S be the original speed of the train.

If he travels a distance of 200km in T hours, can you write down an expression for the speed S ?

 

[Galileo]

Translate the word problem into mathematics. Let's call the original speed of the train v (km/h) and the time it takes t (hours).
So he travels 200 km in t hours at a speed v:

vt=200

If he increases v by 5 km/h, he can travel 200 km in t-2 hours. How would you tranlsate that into an equation?

Doh, Fermat beat me to it.

 

[Fermat]

Great minds think alike