Customers arrive at a gas station that remains open 24 hours a day in the following way: from 24:00 horas. to 7:00 a.m., customers arrive, on average, at a rate of 2 customers per hour; from 7:00 a.m. to 5:00 p.m. it grows linearly until it reaches 20 clients per hour, remaining at this rate until 10:00 p.m., when it begins to decrease until it reaches 2 clients per hour at 24:00.

If we assume that the number of customers arriving at the gas station during disjoint time periods are independent, and taking into account the following intensity function: