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Bus route $$X$$ arrives every $$15$$ minutes and bus route $$Y$$ arrives every $$40$$ minutes. Both buses have arrived now. They will next arrive simultaneously after how many hours?
Correct Answer: 2
The next simultaneous arrival occurs after the LCM of $$15$$ and $$40$$ minutes. This is $$120$$ minutes, which equals $$2$$ hours.
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