During the hours between 6:15 and 8:00pm an average of 140 customers arrive at t

During the hours between 6:15 and 8:00pm an average of 140 customers arrive at the restaurant. Assume that the arrival process can be modeled by a Poisson distribution. The time it takes to pay the cashier get salad and get soup each follows an exponential probability distribution.If the cashier takes an average of 40 seconds to collect money from a customer and the customer averages two minutes to get a salad and one minute to get soup determine the average time a customer spends paying for and getting food if: (A) the customer is getting salad only; and (B) the customer is getting both soup and salad.