Length and Maximum Angle?

It is said that Galileo discovered a basic principle of the pendulum-that the period is independent of the amplitude-by using his pulse to time the period of swinging lamps in the cathedral as they swayed in the breeze. Suppose that one oscillation of a swinging lamp takes 5.5 s. How long is the lamp chain? What maximum speed does the lamp have if its maximum angle from vertical is 3.0 degrees?