Customers arrive at a checkout counter in a department store according to a Poisson Process with rate of 2 customers per quarter of an hour.

Customers arrive at a checkout counter in a department store according to a Poisson Process with rate of 2 customers per quarter of an hour. Find the probability that exactly two customers arrive between 1:00 P.M and 2:00 P.M and between 3:00 P.M and 3:30 P.M. (two separate periods)