5.60 Delivery trucks arrive independently at the Floorstore Regional distribution center with various consumer items from the company’s suppliers. The mean number of trucks arriving per hour is 20. Given that a truck has just arrived answer the following:

a. What is the probability that the next truck will not arrive for at least 5 minutes?

b. What is the probability that the next truck will arrive within the next 2 minutes?

c. What is the probability that the next truck will arrive between 4 and 10 minutes?