What is the probability that both of the molecules have moved outside after 2 seconds (using parameters

Question:

What is the probability that both of the molecules have moved outside after 2 seconds (using parameters from Section 6.2, Exercise 4)?
Consider again the molecules in Section 6.2, Exercises 1-4. Suppose that we wish to consider two molecules instead of one molecule, both starting inside the cell. Find the above probability.