A train travels 500 miles in 8 hours. Assuming that the train continues to travel at a constant rate, write an equation that represents this situation.

Let's call the speed of the train "s" (in miles per hour).

The equation that represents this situation is:

distance = rate x time

Plugging in the given values, we get:

500 = s x 8

Simplifying:

500/8 = s

62.5 = s

Therefore, the equation is:

distance = 62.5t

where "t" is the time (in hours) that the train has been traveling.