How much is the charge for long-distance transportation of severely ill patients when Dongguan ambulances are used for long-distance transportation?

 Dongguan ambulances are used for long-distance transportation. The charges for long-distance transportation of severely ill patients are generally between 600 yuan and 1000 yuan. The charges for long-distance transportation are generally between 7 yuan and 10 yuan per kilometer. Including car treatment, highway, medical equipment, disinfection and sterilization, etc.