The hour hand of this clock is 6 cm long. How far does its tip travel from the time on clock A to the time on clock B? (Take π = 22/7.)

A shows 1:00 and B shows 5:00: 4 hours, so the hour hand turns $4\times 30=120$°, one-third of a circle. Arc = $(1/3)\times 2\times 22/7\times 6=88/7=12$ 4/7 cm. (37 5/7 cm is a whole circle; 25 1/7 cm is two-thirds.)