Let's go back here. Now, at this point, what's the rate of our forward reaction of X to Y? Well, our rate is determined by our rate constant as well as the concentration of X. And because our constant K stays the same at the same temperature going this way, that means our rate is strictly dependent on our concentration. And because we said our concentration is at its maximum at the beginning at time equals zero, that means our rate going this way forward of X converting to Y is at its highest. What about the reverse rate of going from Y to X?