The buses leave in order every half hour. Bus 1 leaves at 8:00. Bus 2 leaves at 8:30. What time do buses 3 and 4 leave?

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Mrs. Grady's class goes to music at 9:30. Every hour her students change activities. If activity 2 begins at 10:30, what time do activities 3 and 4 start?

Patrick and Preston change activities once every hour. Art starts at 10:00. The boys go to two more activates. What time do each of these activities begin?

Students start work in learning stations at 10:30. After 2 hours, they go to recess. What time do students go to recess?

The subway arrives at the station on the hour and half hour. It is now 4:30. Kate's family is on the way, but it will take one hour to get there. What is the earliest time her family can get on the Subway?