Customers arrive at a box office window, being manned by single individual, according to a Poisson input process with a mean rate of 30 per hour. The time required to serve a customer has an exponential distribution with a mean 90 seconds. Find the average waiting time of a customer.
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School is the place where we learn to read and write. It is the most crucial place for a student, and it helps us to learn new things. The teachers are always helpful and teach us important things in life. We must always be regular to school as missing classes can lead to problems during exams.
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