At which of the following speeds can you ride a motorcycle if you carry a six-year-old child?

The photo shows a motorcyclist carrying a child. According to Art. 20 para. 6 pt. 3 of the Road Traffic Act, the speed limit for a motorcycle carrying a child up to 7 years of age is 40 km/h. Since the question concerns a six-year-old child, the maximum speed allowed is 40 km/h, which means that out of the given options, only 30 km/h is a speed compliant with the regulations.