An African elephant can run 15 mph. Write an equation using two variables to show the relationship between the how many hours the elephant runs, r , and the distance the elephant ran, d .

The equation showing the relationship between the number of hours the elephant runs, r, and the distance the elephant ran, d, can be written as:

d = 15 * r

Here, 'd' represents the distance (in miles) covered by the elephant, and 'r' represents the number of hours the elephant runs at a speed of 15 mph.