It takes Julian 1/2

hour to walk 2 miles. He decides to start working in his spare time, but because he wants to make sure he has enough time to go a desired distance he created the data table. At which ratio does the constant of proportionality appear

The constant of proportionality appears in the ratio of the time it takes Julian to walk a certain distance. In this case, the given data table states that it takes Julian 1/2 hour to walk 2 miles. So the ratio of time to distance is 1/2 hour to 2 miles, or 1/2 hour per 2 miles.

Therefore, the ratio at which the constant of proportionality appears is 1/2 hour per 2 miles.