Varun's morning shift begins at the time on clock A and his lunch break starts at the time on clock B. How long does he work before lunch?

A shows 11:40 a.m. and B shows 1:15 p.m. From 11:40 to 12:40 is 1 h and from 12:40 to 1:15 is 35 min: 1 h 35 min. (10 h 25 min subtracts 1:15 from 11:40 on the dial, forgetting noon.)