C2449 Continuous Improvement

The scorching sun was high up in the sky. Yun Fan walked with difficulty. For an entire day, Yun Fan walked a total of 120 meters.

The next day, Yun Fan had already gotten used to it, and his speed was even faster than before.

On this day, he walked a total of 150 meters. Although it was only 30 meters more, this was a quarter of the first day.

However