Задача с тремя неизвестными

The criminal investigation department is investigating the robbery of a factory cashier. At the checkpoint factory of precision mechanics and optics, two criminals attack the cashier. The criminals manage to hide in a car, waiting for them around the corner. Criminal investigation officers Major Dorokhov and Lieutenant Matushkin arrive at the crime scene. They interview witnesses, but they did not really remember either the faces of the attackers or the number of the car, but they noticed that one prevented the other from shooting. There are almost no leads to find criminals. The only evidence that the police have when starting the investigation is the muskrat hat left at the crime scene.