The route traveled by the tip of the hour hand of the stopwatch is a circle, and it goes twice every day and night. Find out how many centimeters the tip of an hour hand has traveled day and night, which is actually twice the circumference of a circle with a radius of 5 centimeters.

D = 2 η * r = 2× 3.14× 5 = 31.4cm (distance of one circle)

3 1.4x2 = 62.8cm (an hour hand is 12h, walking twice a day).