Pi and Circumference

Question

The minute hand of the tower clock is 12 inches long, and the hour hand is 9 inches long. On this clock, what is the positive difference between the number of inches traveled by the tip of the minute hand and the tip if the hour hand in one hour?

Answer 1

The minute hand moves 12π in (the entire circumference)

The hour hand moves (1/12)(9π) or 3π/4 in (going from 12 to 1 is 1/12 of the circumference.

 

What is the difference?