A car covers a distance of 75 km in 3 hours. However, for the first 45 km it travels 18 km/h. At what speed must it travel for the rest of the distance in order to complete the journey on time? （）
A、60 km/h
B、 70 km/h
C、 50 km/h
D、 40 km/h
发布时间：2025-08-02 20:31:35
