Buses to Dorchester and Bournemouth will leave the bus station at the same time again at 11 am.
In this scenario, the buses to Dorchester leave every 12 minutes and the buses to Bournemouth leave every 15 minutes. This means they will align every 60 minutes (the least common multiple of 12 and 15). Since they both left at 10 am, the next time they will leave at the same time will be at 11 am.
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