I'll start by saying that I am unsure whether my answer is correct.
You have a cube which is separated into 125 smaller cubes. This must mean that your cube is 5 smaller cubes long on each side.
This means that the amount of colored small cube sides is 150 (calculated by doing 5*5*6)
A number of sides in total is 750 (125*6)
This would mean that the percentage of colored sides is 20%
So the probability is 1:5 or 20%.
Feel free to correct me if I'm wrong. :)
As of the first one, you could say that a person drove 130 in 2 hours, therefore if you want to find the speed at which the person drove (mph/miles per hour) you divide both numbers with the number of hours traveled.
That draws you to the conclusion that the person was driving at a speed of 65mph (miles per hour).
As of the second, you could say that you paid $48 for 4 lbs of flour for example. If you then want to know the price of 1 lbs of flour you would have to divide both numbers by the amount of flour you paid $48 for.
This tells you that 1 lbs of flour cost $12.
I hope this was helpful, let me know if I misunderstood the question. :)