A walkway is supported by pairs of hollow carbon steel pipes, each having an outer diameter of 2.73 cm and walls that are 2.58 mm thick. Each pair of pipes supports a section of walkway weighing 3090 N. If the elastic limit for carbon steel is 3.87 × 10^8 Pa , how many people can safely stand on a single section of the walkway? Assume an average of 965 N/person .