pls solve this in steps pls solve this in steps

university bookstore opens a single counter to buy back used books at the end of the semester. Students arrive at the counter according to a Poisson process at the rate of 25 students per hour. The bookstore clerk can serve 36 students per hour. The clerks service time is exponentially distributed. What is the average time (in minutes) a student spends trying to sell back their used books, and the probability that less than 3 customers in the queuing system?

a. W = 5.45 minutes and P(n<3) 0.4819

b. W = 3.8 minutes and P(n<3) 0.4819

c. W = 5.45 minutes and P(n<3) 0.6656

d. W = 3.8 minutes and P(n<3) 0.6656