If you plan to walk x kilometers every day, you can get the inequality group.

8 (x19) ≥ 2,200 [Because his 8-day trip will be 2,200 km, it is known that his 8-day trip will be 2,200 km or more].

9(X- 12)≤8(X 19) 【 Because the distance traveled in 8 days is 8(X 19)KM, if he walks 12KM every day, it will take him more than 9 days to drive the same car, which means that the distance traveled in 9 days is less than.

The solution is 256≤X≤260.

Therefore, the planned daily mileage of this car is 250KM to 260KM.