Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area of the tires in contact with the ground if a bicycle and rider have a total mass of 80. 0 kg, and the gauge pressure in the tires is 3. 50×105 Pa. 13. 5 cm^2 22. 4 cm^2 32. 4 cm^2 10. 0 cm^2