A clock was set right at 10:00 a.m. on Monday, as shown. It gains 4 minutes every hour. When it shows 6:00 p.m. on Tuesday, what is the correct time?

On its dial 32 h = 1920 min have passed. It runs 64 min per true hour, so true time $=1920\times \frac{60}{64}=1800$ min = 30 h. Monday 10 a.m. + 30 h = Tuesday 4:00 p.m. (3:52 subtracts 4 min for each of 32 dial hours.)