Recall the example concerning the delivery of an important document. To maximize the chances of on-time delivery, two copies of the document are sent using two services, service A and service B. It is known that the probabilities of on-time delivery are:

0.90 for service A: P(A) = 0.90

0.80 for service B: P(B) = 0.80

0.75 for both services being on time: P(A and B) = 0.75

What is the probability that only service B delivers the document on time?