26. In 2075, the Sun rapidly aged and expanded, and humanity initiated the "Wandering Earth" plan, building engines to push Earth out of the solar system and toward a new home—the Alpha Centauri star in the distant universe. After calculations by scientists, the total distance Earth will travel is 4.2 light-years (a little knowledge: "light-year" is a common unit of length in astronomy). If the speed of Earth's journey is increased by 25%, it can arrive 500 years earlier than planned; if it travels 1.4 light-years at the original planned speed and then increases the speed to 2.5 times the original planned speed, it can arrive \qquad years earlier than planned.
$1000$