SOLUTION: One car travels 30 km/h faster than another. In the same time one travels 200 km, the other goes 320 km. Find the speeds.

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There are different ways to solve this problem.
In my solution I let T to represent the time.
we set up the equation based on the fact that one car is 30km/hr faster than the other.

So = 30
then = 30. so T = 4 hours.
The speed for faster car is = 80km/hr
The speed for slower car is = 50km/hr