At a specified point on a highway, vehicles are known to arrive according to a p

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At a specified point on a highway, vehicles are known to arrive according to a poisson process. Vehicles are counted in 20 second intervals, and vehicle counts are taken in 120 of these time intervals. It is noted that no cars arrive in 18 of these 120 intervals. Approximate the number of these 120 intervals in which exactly three cars arrive. p(n) = lambda tn e-t / 3! The question is how do I find lambda from the given information? If you can explain how to do this than I can solve the problem from there.

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