Grade 2 classes were going for a museum visit on Tuesday. They left the school at 10 o’clock in the morning and took an hour to ride the bus there. Then, they stayed in the museum for 2 hours and rode on the bus for another hour to come back to school. At what time did they arrive back at school?
total time was 1+2+1 = 4 hours
so what time is 4 hours after 10 AM?