I'm not sure how I should go about doing this problem

The maintenance manager at a chemical factory knows the number of repairs per year follows a Poisson process, and that on average there are 60 failures per 10 years and these occur in a random fashion over the years. Expressing probability as a number between 0 and 1.

What's the probability that a randomly selected 30 month time period contains at least 2 repairs?

Can anyone give me some guidance please?

Thanks