Question

The city bus passes Bruno's house every 20 minutes and a local bus passes every 1/2 hour. The last time they passed together was 11:25pm. What will be the next time they pass together?

Answer 1

12:25

Explanation:

City Bus Schedule: 11:25, 11:45, 12:05, 12:25 (just add 20 mins to the time)

Local Bus Schedule: 11:25, 11:55, 12:25 (just add 30 mins to the time)

Then find the first time seen in both schedules!