Is it statistically likely and physically possible to have two civilizations in the same star system?

With our current technology we're able to travel through our Solar System (and beyond) during at least a human lifetime.

Is it physically possible that a star system has more intelligent lifeforms in different planets that belong to an habitable zone?

In other words, let's imagine there is an intelligent life form on some distant star system, with the same advancement we have in space technology; is it possible for such a life form to reach a planet where life has developed and is intelligent (not necessarily at the same technological level, but intelligent), or at least that has developed and is evolving?

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Is it statistically likely and physically possible to have two civilizations in the same star system?

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