Collina's Italian Cafe in Houston Texas, advertises that carryout orders take 25 minutes. Assume that the time required for a carryout order to be ready for a customer pickup has an exponential distribution with a mean of 25 minutes.

What is the probability that a carryout order will be ready within 20 minutes?

If a customer arrives 30 minutes after placing an order, what is the probability that the order will not be ready?

A particular customer lives 15 minutes from Collina's Italian Cafe. If the customer places a telephone order at 5:20 P.M., what is the probability that the customer can drive to the cafe pick up the order, and return home by 6:00 P.M.?