C. An MRI machine is used in hospitals and clinics to take magnetic images of the inside of the human body. A patient is rolled into the machine lying on a gurney. There must be at least 2.5 ft vertically above the gurney for the patient's body and some breathing room. The interior of the MRI machine has an elliptical shape given by 2x^2 + 5y^2 = 20. What is the widest gurney that this MRI can accommodate? Round appropriately to the nearest tenth of a foot.