I need help on 1.1 quiz

Quiz 1.1 - T Mathematics 30-1 10. The time, t seconds, it takes a pendulum to complete one back and forth swing can be determined by the equation t = 0.321 / , where / is the length of the pendulum in inches. A clock manufacturer has an adjustable length pendulum with the shortest length being 6 in and the longest length being 10.5 in. Determine the range of swinging times for this pendulum. A. 0.32